### animal | lamb:

Newborn lamb
* are covered with a densely packed, finely curled wool
  - prey for eagles, mountain lions and bobcats
* die of starvation and dehydration.
* have a soft, woolly, light-colored coat and small horn buds.

Older lamb
* deposit more fat, thus their requirement for protein diminishes.
* provide meat with a stronger flavor than young animals.

Ram lamb
* need nutrition.
* reach puberty.

Single lamb
* are most common, but twins and triplets are occasional.
* weigh about eight pounds, twins, four to five pounds.

### animal:

Lancelet
* Most lancelets have complex organs
  - sense organs
  - jaws
* Some lancelets have hearts
  - hollow dorsal nerve cord
  - sex
  - inhabit water
* also have a type of kidney, but it is vastly different from vertebrate kidneys
  - lack appendages and can move only by bending their bodies back and forth
  - swim very quickly and are able to escape predators
* are also important to the study of the origins of vertebrates
  - bilaterally symmetrical organisms
  - cephalochordates
  - filter-feeders
  - fishlike animals that have bilateral symmetry and live in salt water
  - found in the coastal waters of temperate and tropical regions
  - harvested for human consumption in some parts of Asia
  - inhabitants of soft bottoms
* are marine animals that have long narrow bodies
  - species, often buried in the seafloor
  - quite the tiny organisms
  - separated into males and females, each with a couple dozen gonads
* are small fish like creatures that live in the sandy bottom of shallow tropical oceans
  - fishlike animals with tapered bodies
  - somewhere in between, with a notochord that remains throughout life
  - text book examples of a chordate
  - very common in shallow water
* belong to a subgroup of vertebrates.
* display all four of the vertebrate characteristics throughout their lives.
* have a fish like appearance, but are invertebrates
  - primitive developmental system of peripheral nerves
  - thin layer of skin that covers their internal structure
  - tough protein outer laying
  - opposite sexes with both egg and sperm
  - separate sexes with about the same number of males and females in a population
* includes brains
  - cell membranes
  - cells
  - corpi
  - cytoplasm
  - ears
  - faces
  - heads
  - nuclei
  - plasma membranes
  - sections
  - skulls
  - vacuoles
* lack a vestibular system, a lateral line system, and a fourth ventricle.
* live in all the oceans of the world in warm and cool waters
  - sand and feed with their gill apparatus
  - shallow and brackish water around the world
  - near the coastlines because they prefer sand mixed with shells
* reproduce in a very different way from humans.
* use their skin as a way to exchange gases
  - tail to swim weakly and to wriggle backward into the sand

### animal:

Land animal
* All land animals possess some degree of thermoregulation.
* Every land animal depends to some degree on green plants.
* Many land animals change colors depending on the season so they can blend in at any time of year.
* Most land animals reproduce through internal fertilization.
* are limited to reptiles, like frogs and the tutara, and birds.
* can find a cozy spot to nest in a french drain after a long no-rain drought.
* get oxygen from the air.
* have the opposite problem to freshwater protists.
* require a much greater proportion of bone than the inhabitants of the water.
* use lakes for drinking water.