What are clinical manifestations of hypothyroidism? a. intolerance to heat, tachycardia, and weight loss. b. oligomenorrhea, fatigue, and warm skin. c. restlessness, increased appetite, and metrorrhagia. d. constipation, decreased heat rate, and lethargy?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Wich organism obtains its energy from dead or decaying matter

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.