Question

•What are Protochordata?
•What are Mollusca ?





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Answer 1

Answer:

1.ans: a heterogeneous group of animals of phylum chordata , related to vertebrates which they resemble in possessing gill slits , noto-chord,and dorsal hollows nerve chord or least traces of these

Protochordata are marine animals

Explanation:

2. ans: mollusca is the second largest phylum of invertebrates animals after the arthropoda. the members are known as mollusc or mollusks around 85,000 extant species of mollusc are recognized . the number of fossil species is estimated between 60,000 and 100,000 additional species .

Answer 2

Answer:

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