In a flower, what is the ploidy of the

endosperm after fertilization?



a. haploid
b. diploid
c. triploid
d. hexaploid
e. octaploid


C

Biology & Microbiology

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Which of the following is not a phenotypic trait of bacteria?

A. Nutrient requirements B. Biochemical reactions C. Cell shape D. rRNA sequence

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The first cells appeared on Earth about __________

years after its crust solidified. a. 1 billion b. 200 million c. 3.8 billion d. 4.5 billion e. a few

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The best-known extinction during which all dinosaurs died out completely occurred during the ________ time period

Fill in the blank(s) with correct word

Biology & Microbiology

Two important differences between the processes of natural selection and artificial selection are:

a. descent and modification. b. the selective agent and the traits being selected. c. the pace of change and the period of time. d. B and C, but not A.

Biology & Microbiology