3. what adaptation of land plants it to control gas exchange with the atmosphere?
a. chitin
b. cuticle
c. stomata
d. chlorophyll

4. a plant that remains low to the ground and grows in moist conditions is most likely what type of plant?
a. vascular
b. nonvascular
c. angiosperm
d. gymnosperm

5. terrestrial plants contain lignin to support the plant and vascular tissue to transport water and nutrients through the plant. what are these adaptations in response to?
a. heat
b. gravity
c. dryness
d. gas exchange

How does the nervous system affect the excretory system?

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

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.