Which of the following statements is true about mutations? A. It is a source of genetic variation
B. Rates tend to be very high in most populations.
C. It is generally lethal
D. It affects only somatic cells

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i

The greater an ecosystem's the more likely it is that some organisms could survive catastrophic environmental changes. a. species diversity b. producer population c. water availability d. carrying capacity

What are the functions of lipids or fat have in the human body?