Placoid scales are found on:

a. fleshy-finned fishes.
b. cartilaginous fishes.
c. ray-finned fishes.
d. lampreys.
e. hagfishes


b

Biology & Microbiology

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Klinefelter syndrome (XXY) can be easily diagnosed by _____

a. pedigree analysis b. aneuploidy c. karyotyping d. phenotypic treatment

Biology & Microbiology

In a pedigree chart, a male who does NOT

demonstrate the trait being studied is represented by

a. a darkened square. b. a darkened diamond. c. a clear circle. d. a clear square. e. a darkened circle.

Biology & Microbiology

Morphogens are substances that help control development

Indicate whether the statement is true or false

Biology & Microbiology

Which one of the following statements most closely agrees with the theory of evolution by means of natural selection, as put forth by Darwin?

a. Only the best-adapted organisms will survive. b. Organisms better adapted to their immediate environment are most likely to survive and reproduce. c. Humans arose from chimpanzees. d. Organisms deliberately evolve the structures they need to survive. e. Organisms mutate under unfavorable conditions to become better adapted.

Biology & Microbiology