1. information in the environment that causes an animal to react is (1 point)a control.
an interneuron.
a response.
a stimulus.

2. the more complex an animal’s response to a stimulus, the more likely it is that the animal has (1 point)
many sensory neurons.
many motor neurons.
many interneurons.
many stimuli.

3. of the following choices, the simplest form of nervous system is a (1 point)
ganglion.
nerve net.
nerve cord.
brain.

4. which of the following invertebrates has cerebral ganglia that are organized into a brain? (1 point)
sea star
earthworm
coral
octopu