What causes the main difference between biomes?
a).the climate
b).all of the above
c).the community
d).water

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Physical characteristics of down syndrome

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.