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)

Anumber of whales.

Bnumber of whaling ships.

Cyears that have passed.

Dreproduction rate of the right whale.

1. Animals and plants living on the rocky shores use all of the following special adaptations to live in these conditions except (4 points)
   

Astaying in cracks, under rocks or burrowing.

Bclosing their valves tightly like barnacles and oysters.

Ccamouflaging and appearing to be invisible by blending.

Dfinding places that receive a lot of sun and air

1. Which of the following is not a characteristic shared among all crustaceans?
   

Aexoskeletons

Bchelipeds or claws

Cswimmerets

Dmandibles