Question

question 11 of 20 : select the best answer for the question. 11. one surprising fact of the animal kingdom is that only approximately 5% of animals are classified into which group? a. mammals b. invertebrates c. insects d. chordates mark for review (will be highlighted on the review page)

Explanation:

To solve this, we analyze each option:

• Option A: Mammals are a subset of Chordates, and their percentage is much less than 5% of all animals.
• Option B: Invertebrates make up the majority (about 95%) of animals, so this is incorrect.
• Option C: Insects are a type of invertebrate and also make up a large portion, not 5%.
• Option D: Chordates (which include mammals, birds, reptiles, etc.) make up approximately 5% of all animal species. Most animals are invertebrates (lacking a backbone), so Chordates (with a notochord at some stage) are about 5% of the animal kingdom.

Answer:

D. Chordates