Q:Fact 1: Most invertebrates have a nervous system. Fact 2: Invertebrates are animals without a backbone. Given the two facts above, answer the question "Which type of system do most animals without backbones have?" with the following options: - sensory neurons - Veins and arteries. - Nervous system - Stereo system - Root system - to move people - Skeletal system - insects
A:
Nervous system