All the biological macromolecules contain carbon hydrogen and oxygen however most do not contain nitrogen. The category that contains nitrogen are

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

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.