Question

Identify the correct statement.

• A. All vertebrates are chordates but all chordates are not vertebrates.
• B. All craniates are vertebrates but all vertebrates are not craniates.
• C. All flatworms possess metamerism but all metamerically segmented organisms are not flatworms
• D. All are correct.

Answer 1

Answer: (D)

The main difference between chordates and vertebrates is that some chordates do not have a vertebral column whereas all vertebrates have a vertebral column. Hence, all vertebrates are chordates but all chordates are not vertebrates. All craniates are vertebrates and also all vertebrates are craniates. All flatworms possess metamerism but all metamerically segmented organisms are not flatworms because the segmented worms belong to Annelida and have metameric segmentation.