### web:

Food webs
* Some food webs are very complex.
* are a central organizing theme in ecology
  - model scientists use to show how food chains in a community are interconnected
  - more realistic picture of what actual happens in the ecosystem
  - another emergent property of ecosystems
  - based both on free-floating algae and upon aquatic plants
  - basically a bunch of food chains all in one
* are complex models of the energy flow
  - complicated by the fact that many species feed at various levels
  - cycles of what eats what
  - defined by their biomass
  - graphical depictions of the interconnections among species based on energy flow
  - important for animals and human
  - more complex, and consist of a network of linked food chains
  - networks of feeding interactions among species
  - often complex, with animals eating more than one prey item
* are, of course, collections of organisms.
* can support food chains that are long and complicated, or very short.
* connect many different food chains, and many different trophic levels.
* describe interdependencies among species in an ecosystem.
* describe the complex interactions within ecosystems better than food chains
  - patterns of energy flow in an ecosystem by modeling who consumes who
  - feeding connections between organisms in an ecosystem
  - transfer of energy between species in an ecosystem
* do pose some problems for ecological studies.
* explore how all life is interconnected.
* have the same core features of a food chain.
* identify the relationships among producers, consumers, and decomposers in an ecosystem.
* illustrate the same information but use lines to connect each eater to what it eats.
* occur all over the world.
* represent complex patterns of feeding links among species within an ecosystem
  - one of the most complex aspects of community biotic interactions
* show all feeding relationships at each trophic level in a community
  - groups of animals that have the same predators and prey in an ecosystem
* show how many animals are connected in many ways to find food
  - organisms are affected by each other
  - that food energy can move through several different pathways
* show the interdependence among organisms
  - more complex interactions between a range of organisms in an ecosystem

### web:

Spider webs
* Most spider webs are very thin , but are also very strong
  - thin, but are also very strong.
  * A 'spider web' sticky net that spiders make from silk to trap their prey. When insects fly or crawl into the web, they get stuck and the spider eats them. Most spider webs are very thin, but are also very strong. Different kinds of spiders make different types of webs. Spiders make different webs in different places to trap many kinds of prey
* are a great place to look for clues.
* play a crucial role in the children's novel Charlotte's Web.
* stream down from branches of a tree.

### websites:

Online casino
* are websites.
* give away free money for everyone to play.
* have nude women and win real money betting and wagering online.
* offer virtual gambling over the Internet.

Weed killer
* Some weed killers kill dandelions
  - vegetable plants
  - weeds
* can be deadly to lilies, damaging their roots
  - do the most damage to trees
  - harm gardens, trees, shrubs and breed resistant weeds
  - kill trees

### weed killer:

Atrazine
* are chemical compounds
  - herbicide
* continues to be the herbicide of choice for most weed situations.
* runs off corn fields into lakes, rivers, streams and eventually our drinking water.

Paraquat
* herbicide that is widely used in many countries.
* is known to increase lipid peroxidation in leaf tissue
  - one of the top three herbicides in use in the world
  - toxic to humans
  - used on corn, soybeans, cotton, fruit and a variety of other products
* non-selective contact herbicide with no soil residual activity.
* restricted-use herbicide.
* selectively concentrates in pulmonary cells.