The term reproductive isolation mechanism refers to ____
a. specific areas where males compete or display for females
b. the process by which sexual selection evolves within a population
c. a blockage of gene flow between populations
d. the inability of a species to continue reproduction
e. legal limits to procreation
ANSWER: c
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Explain how nutrient-rich runoff can cause waters to become hypoxic
A. Algae and cyanobacteria flourish on the nutrients in the run-off. Heterotrophic microbes then flourish on the organic molecules produced by these organisms, using oxygen in the process. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. B. Algae and cyanobacteria flourish on the nutrients in the run-off, using oxygen in the process. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. C. The nutrients in the run-off often include chemicals that spontaneously oxidize in the presence of oxygen. As such, they tend to deplete the amount of oxygen present in an area simply by being present themselves. This consumption of oxygen leads to a hypoxic state in the area. Larger animals cannot survive in the hypoxic area. D. It doesn't. This claim is a scare tactic used by environmental extremists to prevent farmers and individuals from fertilizing their crops and lawns. There is no induction of a hypoxic state in bodies of water where run-off occurs.
Which statement concerning systems biology is FALSE?
a. It involves the reductionist approach. b. It involves the analysis of large amounts of data. c. It focuses on the functioning of biological systems. d. It focuses on individual components rather than the whole. e. It is also called integrative biology.
Some memories are emotionally charged because the amygdala triggers associations between fear and sensory information.
Answer the following statement true (T) or false (F)
Heart cells in the embryo will be derived from which germ layer?
A) mesoderm B) endoderm C) ectoderm D) none of the above