Anew organism has been discovered. this organism has a bilaterally symmetric unsegmented body. it's capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body. based on this evidence, which phylum would this new animal likely be classified into?
a. mollusca
b. echinodermata
c. nematoda
d. arthropoda

The correct answer option is A. Mollusca.

Explanation:

We are given that a new organism has been discovered which has a bilaterally symmetric unsegmented body and is capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body.

Given the above information, we are to determine which class this phylum can be classified into.

The most appropriate answer for this is Mollusca. Here, the description matches that of a snail.

Other classifications like arthropoda have segmented bodies while echinodermata are symmetrical.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."