The cavity of the sac that will directly enclose the

embryo is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.


Answer: b

Biology & Microbiology

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The conversion of light into chemical energy is called photoautotrophy

Indicate whether the statement is true or false.

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Keystone species can have significant influences over several populations in a community through:

A. their ability to leave their environment relatively unchanged. B. their large body sizes. C. their effect on high amounts of biomass and energy transfer between populations. D. their roles as prey species for predator populations in the community. E. their avoidance of antagonistic interactions.

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What are carcinogens?

A) Physical or chemical factors that can lead to mutations causing cancer B) All mutagens C) Errors during DNA replication D) Chemical factors that can treat cancer

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If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in each daughter cell following cytokinesis?

A) 10 B) 20 C) 40 D) 80

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