Which of the following is an invertebrate?

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Multiple Choice

Which of the following is an invertebrate?

Explanation:
Understanding what makes an animal an invertebrate is the key idea. An invertebrate lacks a vertebral column. The earthworm fits this because it’s a segmented worm (an annelid) with no bones or spine; it relies on a fluid-filled body plan to support itself rather than a bone-based skeleton. The other options all have backbones: humans have a vertebral column, whales are mammals with spines, and frogs are amphibians with a vertebral skeleton. Therefore, the earthworm is the invertebrate.

Understanding what makes an animal an invertebrate is the key idea. An invertebrate lacks a vertebral column. The earthworm fits this because it’s a segmented worm (an annelid) with no bones or spine; it relies on a fluid-filled body plan to support itself rather than a bone-based skeleton. The other options all have backbones: humans have a vertebral column, whales are mammals with spines, and frogs are amphibians with a vertebral skeleton. Therefore, the earthworm is the invertebrate.

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