Angiosperms that originated as hybrids resulting from a cross between two closely related species are known as ____
a. paleopolyploids
b. autopolyploids
c. allopolyploids
d. hexapolyploids
e. tetrapolyploids
ANSWER: c
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Why did the British naturalist Edward Forbes conclude that animal life could not exist in the sea below a depth of 55 meters?
What will be an ideal response?
Oxygen concentration generally plays an important role in regulating respiration:
a. all the time. b. never. c. only when the carbon dioxide concentration falls markedly. d. only when the oxygen concentration falls markedly. e. only when the pH falls markedly.
Entamoeba histolytica can cause keratitis if it is introduced through an abrasion in the conjunctiva
Indicate whether the statement is true or false
The ________ is a microtubule structure that binds to sister chromatids to separate them in anaphase
Fill in the blank(s) with correct word