Which is not a characteristic of the spiders?

a. four pairs of walking legs
b. book lungs for respiration
c. antennae and mandibles for sensory perception
d. body divided into cephalothorax and abdomen

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Why do the circulatory systems of land vertebrates have separate circuits to the lungs and to the rest of the body?