Why are protozoa significant? select all that apply.
protozoa contaminate the water supply.
protozoa do not contribute to a food chain.
some protozoa clean polluted water.
some protozoa are parasitic and cause diseases like malaria.
protozoa have an important role in the food chain.

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament