What structure would you expect to find in every type of mollusk (that is, gastropods, cephalopods, and bivalves)?

The options

a. hinge

b. tentacles

c. mantle

d. single-lens eyes

e. valve

The CORRECT ANSWER IS c.

c. mantle

Explanation:

Phylum: Mollusca (Mollusks)

Class: Polyplacophora (Chitons)

Class: Gastropoda (snails)

Class: Bivalvia (Clams)

Class: Cephalopoda (Nautilus, Squid, Octopus)

All mollusks possesses a visceral mass, a mantle, and a foot. The visceral mass houses the digestive, excretory, and reproductive organs. The mantle acts as a covering. It may produce a shell. The foot is muscular and is used for movement, griping, and/or food hunting.

Mantle, can also be termed the pallium, plural  pallia, or palliums, in biology. It as a soft covering (often toughened by calcified plates, of barnacles),

produced from the body wall, of brachiopods and mollusks.

It secretes the shell in organism that make use of shells. In bivalves, it is links edge may be joined at the edge to form siphons for directing water into and out of the mantle cavity.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.