D.) All levels of the pyramid are equally important.
Answer:
Phenotypic variation, then, is the variability in phenotypes that exists in a population. For example, people come in all shapes and sizes: height, weight, and body shape are phenotypes that vary. Hair, eye color, and the ability to roll your tongue are variable phenotypes, too
Explanation:
Answer:
energy
Explanation:
calorie is best related to the word energy
Answer: 
Explanation: The peripheral nervous system (PNS) is the division of the nervous system containing all the nerves that lie outside of the central nervous system (CNS).