Question

cambrian web quest
most life in the cambrian were invertebrates. what are invertebrates?
animals that eat plants
animals that eat other animals
animals with no backbones
animals that swim upside down

Explanation:

Invertebrates are defined based on the absence of a backbone. The first two options describe herbivores and carnivores (related to diet), and the last option is about a swimming behavior. The key characteristic of invertebrates is the lack of a backbone.

Answer:

animals with no backbones