### animal:

Arthropod
* All Arthropods have their skeleton on the outside of their body and it also serves as their skin.
* All arthropods are invertebrate animals, without backbones
  - exhibit the following characteristics
* All arthropods have a hard exoskeleton made of chiton, a type of protein
  - all the internal organs essential to any complex animal
* All arthropods have an exoskeleton made of chitin which offers support and protection
  - of chiton, and they all have jointed appendages
  - open circulatory system
  - one thing that is the same
  - several pairs of jointed legs and a hard outside covering, or exoskeleton
  - including houseflies and mosquitoes have compound eyes
  - undergo periodic molting to grow out of the confines of their rigid exoskeleton
* MOst arthropods use either the shorter or rear appendages for moving in both sea and land.
* Many arthropods are beneficial to man
  - capable of carrying disease
  - exhibit parental care to ensure their young survives
  - go through metamorphosis or physical changes
* Many arthropods have appendages on each , or most , of their segments
  - intimate relationships with plants
  - overcome the harsh conditions of winter in a hibernation-like state called diapause
  - rub specialized body parts together to produce sound
  - serve as intermediate hosts for various parasitic helminth organisms
  - tell lies to other arthropods
* Most arthropods absorb oxygen.
* Most arthropods are benthos or bottom dwelling organisms
  - located in islands
  - small because the rigid exoskeleton imposes limitations on size
  - very non-caring parents
  - carry genes
  - cause damage
* Most arthropods consume dominant organisms
  - food
  - solid food
* Most arthropods eat fungi
  - soil fungi
  - expend energy
* Most arthropods go through juvenile stages
  - life stages
  - similar life stages
* Most arthropods has-part exoskeletons
  - extremities
  - muscles
* Most arthropods have ability
  - antennae and compound eyes
  - chew mouthparts
* Most arthropods have compound eyes composed of many individual lenses
  - that allow for very good vision of movement
  - excretory structures
  - eyes, which can be either simple or multi-faceted compound eyes
  - hard exoskeletons
  - heads
  - male and females
  - rigid exoskeletons
  - segmentation
  - separate sexes
  - serious limitations
  - size limitations
  - tough exoskeletons
* Most arthropods invade environments
  - freshwater environments
* Most arthropods live in areas
  - perform functions
* Most arthropods possess antennas
  - bodies
* Most arthropods rely on eyes
  - reproduction
  - sexual reproduction
* Most arthropods require high moisture
* Most arthropods share certain characteristics
* Most arthropods shed entire exoskeletons
* Some arthropods adapt to conditions.
* Some arthropods are bees, crabs, shrimp, spiders, beetles and millipedes
  - seen as pests, but they can also be highly beneficial to the wider environment
  - breathe use gills
  - capture prey
  - die of dehydration
* Some arthropods eat insects
  - scorpions
  - soil fungi and bacteria
  - excrete waste
* Some arthropods exhibit cleavages
  - superficial cleavages
  - exist within both realms and none as much so as spiders
  - fall into streams
  - graze on bacteria
* Some arthropods has-part bones
  - lungs
* Some arthropods have a different phase that looks totally different than the adult
  - calcium in addition to chitin in their exoskeleton for extra strength
  - carapaces
  - color vision
  - cuticles
  - dome carapaces
  - methods
  - outer cuticles
  - sides
  - tails
  - tough cuticles
  - tubules
  - hide in nooks
* Some arthropods inhabit beaches
  - mediterranean beaches
  - sandy beaches
  - invade areas
* Some arthropods live in Canada
  - Washington
  - grass
* Some arthropods make chemicals
  - up diets
  - move appendages
  - occur in soil
* Some arthropods possess a type of eye known as a compound eye
  - tracheae
* Some arthropods prey on larvae
  - mosquito larvae
  - relate to lobsters
  - resemble centipedes
  - serve as hosts
  - transmit viruses
  - transport oxygen directly to their muscles via trachae
  - undergo transformation.
  * are made up of four groups of living animals and one group of extinct animals. The four groups are insects, arachnids, crustaceans, and myriapods. The trilobites are extinct, and they are the second most famous type of fossils, after the dinosaurs
* also have a skeleton but it is on the outside of their bodies
  - very complex internal system
* are a   source of food for many animals, including humans.
* are a group of animals that includes insects and arachnids
  - with jointed legs and a hard exterior skeleton
  - organisms that include insects, ticks and spiders
  - huge and diverse group with a long history
  - lot more than just delicious feasts and disgusting pests
  - major part of the oceanic food chain
  - abundant in terrestrial, marine, and freshwater aquatic habitats
* are an important group of invertebrates
  - source of protein especially for young creatures
  - animals like insects, arachnids, and crustaceans
* are animals with an exoskeleton, such as insects, crustaceans, and arachnids
  - external skeletons and jointed legs
  - animals, so they go in Kingdom Animalia
  - another important and conspicuous part of the soil community
  - apparently the most diverse of the Cambrian animal groups
  - bilaterally symmetrical protostomes with strongly segmented bodies
  - both harmful and helpful to humans
  - bugs with jointed legs
  - characterized by a stiff exoskeleton, segmented bodies, and jointed appendages
  - classified based on the number and structure of body segments and appendages
  - coelomate and their circulatory system is open
  - cold-blooded insects.arthropods are cold blooded
  - covered with a tough, resilient integument or exoskeleton of chitin
  - creatures, which in life have an exoskeleton also called a carapace- or shell
  - decomposers also found in grasslands
  - direct herbivores and terrestrial vertebrate carnivores are consuming insects
  - divided into five sub-phyla
  - highly diverse
  - important in early summer, especially to chicks
  - insects and arachnids, including spiders, ants, ticks, beetles, flies, scorpions
* are invertebrate animals having an exoskeleton, a segmented body, and jointed appendages
  - such as crustaceans
  - with several pairs of joined legs
  - known to regenerate appendages following loss or autotomy
  - mainly terrestrial, but aquatic representatives are well known
  - more numerous and varied than any other animal group
  - named for their jointed appendages
  - of ecological importance because of their sheer numbers and extreme diversity
  - only one group of invertebrate animals
  - represented in every habitat on Earth and show a great variety of adaptations
* are segmented and possess a true coelom
  - invertebrates which have articulated exoskeletons
  - some of the world most popular seafood including lobster, crab, and shrimp
  - supposed to be closely related to Annelids
  - the first group of organisms to fly
* are the largest and most diverse of all animal groups
  - phylum in the animal kingdom
  - main prey
  - most abundant animals on earth
  - natural vectors of the tick-borne encephalitis complex agents
  - transformers
  - true coelomate animals and exhibit prostostomic development
  - unique among animals in having a hard exoskeleton made of chitin
  - usually small
  - very diverse, and therefore can locomote in a wide variety of ways
* begin as eggs and can follow several different life cycles, depending on the group.
* belong in the kingdom, Animalia
  - to the same family as modern insects
* can excrete bodily waste through different ways
  - spread disease to humans when the arthropods A. feed on the humans
  - walk, crawl, climb, fly, swim, and almost every possible type of moving
* constitute three-fourth of the animal kingdom and inhabit a variety of habitats.
* contain an exoskeleton made of chitin
  - the largest number of species of any animal phylum
  - well developed sense organs
* do everything with legs or modified legs.
* endemic to Florida scrub.
* form the bulk of both faunas, both numerically and taxonomically
  - current focus for work relating the processes of development and evolution
* generally grow by molting their exoskeletons in a process called ecdysis.
* go a long way back in human history and human imagination.
* gulp air.
* have a bilaterally symmetrical body, usually consisting of a head, thorax, and abdomen
  - complete digestive system, complex organ systems, and sophisticated behaviors
  - excretory system that they use and get rid of wastes through their anus
* have a hard body covering called and exoskeleton that is made of chitin
  - exoskeleton, a segmented body, and jointed legs
  - hard, jointed outer covering called an exoskeleton
  - nervous system that looks a bit like a ladder
* have a segmented and bilaterally symmetrical body
  - body, a tough exoskeleton, and jointed appendages
  - significant impact on people in several ways
  - variety of organs specialized in gas exchange
  - wide variety of respiratory systems
  - an external shell made of chitin, a chitinous exoskeleton
* have an open circulatory system, and separate sexes
  - bodies that are internally and externally segmented
  - diferences, too
  - exoskeletons made of chitin
  - exoskeletons, jointed appendages, a segmented body, and an open circulatory system
  - in common an exoskeleton and a ventrally located nervous system
  - many adaptations that allow it to survive in their environment
  - one big bone on the outside of their bodies
* have open circulatory systems , although most have a few short, open-ended arteries
  - specialized cells in the green gland that are ameboid and aid in digestion
  - what is called an open circulatory system
* hunt for food.
  - wingless insects
* includes brains
  - cell membranes
  - cytoplasm
  - ears
  - faces
  - nuclei
  - plasma membranes
  - sections
  - shells
  - skulls
  - spiders, scorpions, lobsters, and insects
  - thoraxes
  - vacuoles
* inhabit almost all habitats.
* is an invertebrate
  - on the land and in the sea
* molt or shed their exoskeleton and replace it with a bigger one.
* molt, have heads with many sensory organs.
* move using well-developed groups of muscles that are coordinated by the nervous system.
* need oxygen.
* occupy an enormous variety of Earth's habitats.
* occur in all environments and situations.
* often go unnoticed, yet their role in virtually every ecosystem on earth is critical.
* possess a rigid cuticular exoskeleton consisting mainly of tanned proteins and chitin
  - semi-closed circulatory system
* range in size from microscopic to several inches in length.
* represent a wide variety of soil dwelling insects, spiders and mites.
* show a large degree of variation in segmental and limb patterning.
* transmit many communicable diseases.
* undergo changes as they grown and mature through a process known as metamorphosis.
* walking in phase move the same leg on each side of the body at the same time.
* weigh little so they show few specialized climbing adaptations.
+ Appendage: Animal anatomy :: Developmental biology
  * Many arthropods have appendages on each, or most, of their segments. Millipedes, for example, have many segments, and almost all carry two legs. Insects have exactly six legs, two on each segment of the thorax.