Question

which term represents animals without backbones?
○ invertebrates
○ heterotrophs
○ autotrophs
○ vertebrates

Explanation:

To solve this, we analyze each term:

• Invertebrates: Animals without a backbone (vertebral column).
• Heterotrophs: Organisms that obtain food from other sources (not about backbone).
• Autotrophs: Organisms that make their own food (not about animals/backbone).
• Vertebrates: Animals with a backbone.

So the term for animals without backbones is invertebrates.

Answer:

A. invertebrates