Four of the five answers listed below are related by the same gender. Select the exception
a. megaspore
b. integuments
c. embryo sac
d. microspore
e. egg
d
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In the last 20 years one concern of scientists who study amphibians is that
A. genetic diversity is being increased too rapidly for proper maintenance. B. the edge effects are causing declines in species numbers. C. DDT is affecting reproduction by thinning the egg membranes. D. populations are diversifying rapidly and speciation is occurring. E. many species are declining or have gone extinct in recent years.
Which letter points to the counterpart of a stem
in a flowering plant? a. A b. B c. C d. D e. none of these
Blood in the veins looks purplish because ____
a. it contains less oxygen than arterial blood b. most of the oxygen is dissolved in the plasma c. less oxygen is in the plasma compared to bound to hemoglobin d. it contains less carbon dioxide e. veins run deeper than arteries
The hydrophobic tails of a phospholipid are composed of
A. fatty acids. B. phosphate. C. alcohol. D. glycerol. E. All of these choices are correct.