GENERAL HISTOLOGY

Detailed explanation-1: -The largest class in the phylum Cnidaria is Anthozoa a class of marine invertebrate animals containing 6, 000 species including the corals, anemones, sea fans, and sea pens.

Detailed explanation-2: -1. The realization that in most aquatic environments the virioplankton is the most abundant plankton class has revived scientific investigation into the natural state of viruses in aquatic environments.

Detailed explanation-3: -Mollusks display a wide range of morphologies in each class and subclass, but share a few key characteristics, including a muscular foot, a visceral mass containing internal organs, and a mantle that may or may not secrete a shell of calcium carbonate (Figure 1).

Detailed explanation-4: -Nemertea, or ribbon worms, are distinguished by their proboscis, used for capturing prey and enclosed in a cavity called a rhynchocoel.