While sampling marine plankton in a lab, the student encounters fertilized eggs and decides to hatch them in the lab. The student observes that the blastopore develops into the mouth. They also notice on further development that the animal has an 8-plated shell and a radula.
These eggs most likely belong to a/an _______.

A) mollusc.
B) echinoderm.
C) nematode.
D) arthropod.

In mollusks such as snail, sepia radula are present. Radula have row of teeth consists of marginal teeth, lateral teeth and a median tooth and are used to peel off plant parts during feeding. They also used to scrape rocks to make depression in rocks for their habitats.

luisvaschetto luisvaschetto · Answer 2 · 2021-10-31T13:40:47+01:00

The eggs of this organism most likely belong to a MOLLUSC (Option A).

Molluscs (phylum Mollusca) are protostomes, i.e., they are organisms where the embryonic blastopore develops into the mouth, while the anus develops on the opposite side.

These organisms (molluscs) are invertebrates, i.e., soft-body animals without any skeleton, which can be enclosed in a shell for protection.

The radula is a body structure used by molluscs for feeding, it is present in all molluscs except bivalves (only in molluscs).

Polyplacophora is a class of the phylum Mollusca that have a shell composed of eight separate plates or valves.

In conclusion, the eggs of this organism most likely belong to a MOLLUSC (Option A).

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