If fish do not add or remove air from their air bladders their overall density _____ when they descend from the surface to greater depths.   increases   decreases   stays they same   depends on whether they are physoclistous or physostomous

How does an arthropod growth curve compare with yours?

The eggs of "Old World" and "New World" hookworms are easily differentiated. True O False

O They are considered plant parasites. Barnacles are crustaceans that live in the ocean. Barnacle larvae are motile and secrete a sticky substance that allows them to attach to a suitable substrate. As they mature into sedentary adults, they secrete layers of calcium carbonate that serve as a protective covering. Some barnacles have been known to attach to the sides of whales. This benefits the barnacles in that they are constantly transported to locations with new sources of food. The whes neither benefit nor are harmed by the presence of barnacles. Barnacles follow r selection strategies. How would the interaction between barnacles and whales be described?" O Commensalism O Mutualism O Competition O Parasitism Sea otters. Enhydra lutris. are predators of sea urchins, Strongylocentrotus