Primary producers obtain energy from a(n) __________ source and use it to build organic compounds from inorganic starting materials.
Fill in the blank(s) with the appropriate word(s).
abiotic
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You are a doctor examining a patient's blood test results. The patient's T cell count is low, and T cells that are present are not well developed. You examine scans of the patient's thymus. It is underdeveloped, which means the T cells in the blood ______
(Select all correct answer options.) A. will be present in lower numbers because the thymus is where T cells are formed. B. will be present in lower numbers because the thymus is where T cells mature. C. will have not undergone selection against self-recognition, and the patient will be more susceptible to autoimmune diseases.
Chewing
a. breaks food down into smaller pieces. b. physically and mechanically breaks up the food. c. increases the surface area of food exposed to digestive enzymes. d. mixes some enzymes with the food. e. does all of these.
Which of the following is an advantage to using phenolics as antimicrobial agents?
A. They are effective sterilants against all microbial forms. B. The presence of organic matter does not limit its antimicrobial qualities. C. They have low toxicity. D. They are not susceptible to resistance by organisms.
Which of the following is not a basic theory of biology?
A. theory of gravity B. gene theory C. theory of evolution D. theory of ecosystems E. cell theory