When an embryo partially splits after day 12 of development what arises?

a. fraternal twins
b. triplets
c. a fetus with extra limbs
d. conjoined twins
e. fetus in fetu


D

Biology & Microbiology

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Polar and charged molecules typically cross the cell membrane by way of ____

a. simple diffusion b. osmosis c. filtration d. active transport e. facilitated diffusion

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Which of the following organisms employs a

contractile ring during cell division?

a. bears b. humans c. roses d. pigs e. more than one of these

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Select the three layers of the human eye.

a. sclera b. choroid c. retina d. all of the above

Biology & Microbiology

Communities exist within populations which exist within ecosystems.

a. true b. false

Biology & Microbiology