Which of the following best defines demography?
a. statistical study of population changes
b. qualitative study of population features
c. statistical study of human populations
d. qualitative study of life expectancy
a. statistical study of population changes
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Vernalization can result in the remodeling of chromatin in some species, which means:
A. plants are able to "know" if they have experienced winter. B. plants can pass on acquired changes to their offspring. C. plants may grow new cells, and those cells will not "know" they have experienced winter. D. products of mitosis will not "remember" winter. E. products of meiosis will "remember" winter.
The mammalian acrosome contains enzymes that ____
a. digest the zona pellucida b. digest the endometrium c. stimulate ovulation d. stimulate sperm motility e. inhibit premature ejaculation
Why is fire-suppression in chaparral habitats not a good strategy for protecting species in this biome?
1.It prevents seeds of plants from sprouting if there is no fire to score the seed. 2.It prevents patches from opening up for succession to take place. 3.It prevents nutrients from being released into the soil. 4.It prevents larger trees from dying to create more space for new individuals.
Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A. a few groups of nitrogen-fixing bacteria. B. the breakdown of minerals. C. a few genera of detritivores. D. the breakdown of dead plants. E. nitrogen-containing fertilizers.