Why are some ecosystems more productive then others?
a. some ecosystems work harder than others
b. certain ecosystems receive from humans
c. some ecosystems have more nutrients available than others

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

What two conditions must be present for osmosis to occur?