Many years ago, the population of right whales decreased dramatically due to the large number of whaling ships hunting them. eventually, most countries outlawed the hunting of these and other whales and the number of whaling ships hunting them decreased. over time the population of the right whales increased again. in this situation the independent variable is the (4 points)
a. number of whales.
b. number of whaling ships.
c. years that have passed.
d. reproduction rate of the right whale.

11. animals and plants living on the rocky shores use all of the following special adaptations to live in these conditions except (4 points)
a. staying in cracks, under rocks or burrowing.
b. closing their valves tightly like barnacles and oysters.
c. camouflaging and appearing to be invisible by blending.
d. finding places that receive a lot of sun and air

17. which of the following is not a characteristic shared among all crustaceans?
a. exoskeletons
b. chelipeds or claws
c. swimmerets
d. mandibles