In the figure above, the population is:
a. highly fit.
b. small in population size.
c. experiencing background selection.
d. experiencing drift.
e. in equilibrium.
A
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Which of the following statements about angiosperm reproduction is true?
A. It is less efficient than gymnosperm reproduction and requires more pollen. B. Animal pollination requires more energy than wind pollination. C. The female gametophyte in angiosperms is larger than in gymnosperms. D. There are a diverse array of flower shapes and colors, largely related to the mode of pollination. E. Fruits reduce the success of dispersal because animals consume the seeds when eating the fruits.
Nucleic acids are long polymers of repeating subunits called ________.
Fill in the blank(s) with the appropriate word(s).
What percentage of Earth's productive land is currently used by the human population for crops and livestock?
A) 20% B) 75% C) 40% D) 55% E) 90%
Cotyledons and endosperm both provide nutrition. What is the difference between them?
A) Cotyledons provide nutrition for the developing embryo; endosperm provides nutrition for the young seedling. B) Endosperm provides nutrition for the developing embryo; cotyledons provide nutrition for the young seedling. C) Cotyledons are found only in flowering plants; endosperm is found only in young ferns. D) Endosperm is found only in monocots; cotyledons are found only in dicots. E) Endosperm is always photosynthetic; cotyledons are usually not.