Which of the following scientists argued that variation among individuals allows evolution to occur?

A) Aristotle
B) Lamarck
C) Linnaeus
D) Wallace


D

Biology & Microbiology

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In mammalian defenses against invading pathogens, all of these are considered nonspecific defense mechanisms EXCEPT

A. acquired immunity. B. the skin. C. mucous membranes. D. the inflammatory response. E. antimicrobial proteins (e.g., interferon).

Biology & Microbiology

Why does meiosis in females produce only one viable gamete while meiosis in males produces four? What will be an ideal response?

Biology & Microbiology

A nucleotide may consist of

a. deoxyribose or ribose. b. purines or pyrimidines. c. phosphate groups. d. all of the above.

Biology & Microbiology

Unlike most bony fishes, sharks maintain body fluids that are isoosmotic to seawater, so they are considered by many to be osmoconformers. Nonetheless, these sharks osmoregulate at least partially by _____

A) using their gills and kidneys to rid themselves of sea salts B) monitoring dehydration at the cellular level with special gated aquaporins C) tolerating high urea concentrations that are balanced with internal salt concentrations to seawater osmolarity D) synthesizing trimethylamine oxide, a chemical that binds and precipitates salts inside cells

Biology & Microbiology