Although both adult stem cells and embryonic stem cells are used for research, embryonic stem cells are of particular interest among researchers. Which medical advancements are possible using these stem cells? Where ethical issues could arise from using embryonic cells as opposed to adult stem cells

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

The process of replication is the same for all living things because