Create two food chains from the following list. Use Figure 3 to help you. raccoon
mallard duck
mosquito larva
algae
Elodea
freshwater clam
human
duckweed

b.have there own function.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

not only is it colder, it also becomes darker, less salty, and more dense.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.