Chapter 30, Problem 3STP

Summary Introduction

Introduction:

The phylum Chordata is the group of animals, which have a notochord in any stage of their lifetime. The fishes, amphibians, reptiles, mammals, birds, etc. belong to this group.

Answer to Problem 3STP

Correct answer:

Option (A).

Explanation of Solution

Explanation/justification for the correct answer:

Option (A) invertebrate chordates lack a backbone. The invertebrate chordates are those organism, which do not have a vertebral column or a backbone. Hence, the correct answer is option (A).

Explanation for incorrect answer:

Option (B) invertebrate chordates lack a notochord. All the organisms of phylum Chordata have a notochord. Hence, it is an incorrect answer.

Option (C) other members of the phylum lack a backbone. All the other members of the phylum chordate except for invertebrates have a backbone. Hence, it is an incorrect answer.

Option (D) other members of chordates lack a notochord. All the organisms of phylum Chordata have a notochord, including vertebrates and non-vertebrates. Hence, it is an incorrect answer.