Why might polar bears become extinct
a. they do not have any predators
b. they may drown when the glaciers melt
c. their thick fur is not suited for a warming climate
d. too many hurt them

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