Male redback spiders benefit when they are eaten by their mates because
A. they ultimately have higher reproductive success.
B. they are only partially eaten and can regrow lost parts.
C. they would die soon after copulation anyway.
D. they don't have to fight other males.
E. None of the answer choices is correct.
A. they ultimately have higher reproductive success.
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Researchers tested nitrogen loss from soil where the moss Dawsonia was growing, and compared it to soil from which Dawsonia had been removed. The data are presented below
Researchers decided to test the hypothesis that if the 1-meter-tall Dawsonia gametophyte-sporophyte plants had acted as a physical buffer, then they would have reduced water's ability to erode the soil and carry away its nitrogen. They began with four equal-sized areas where Dawsonia mosses grew to a height of 1 m above the soil surface. One of the four areas was not modified. In the second area, the mosses were trimmed to a height of 0.5 m above the soil surface. In the third area, the mosses were trimmed to a height of 0.25 m above the soil surface. In the fourth area, the mosses were trimmed all the way to the ground, leaving only the rhizoids. Water, simulating rainfall, was then added in a controlled fashion to all plots over the course of one year. The figure below presents four graphs that depict potential results of this experiment. In the figure above, which graph of soil nitrogen loss over time most strongly supports the hypothesis that if the 1-m tall Dawsonia gametophyte-sporophyte plants had acted as a physical buffer, then they would have reduced water's ability to erode the soil and carry away its nitrogen? A) A B) B C) C D) D E) None of these graphs support the hypothesis.
Vibration of the ________ bends hairs of the hair cells, which ultimately generate impulses in ________
A) basilar membrane; hair cells B) sensory neurons; tectorial membrane C) hair cells; sensory neurons D) organ of Corti; hair cells E) basilar membrane; sensory neurons
Most of the energy contained in one trophic level is "lost" when it gets to the next trophic level. What form does the lost energy take?
A) free electrons B) metabolic heat C) potential energy, in chemical bonds D) kinetic energy, in the motion of consumers
The most important aspect of Watson and Crick's discovery of the structure of DNA was that it __________.
A. described a role for nitrogen in biological molecules B. described a mechanism for formation of all biological molecules C. helped explain how cells divide to form identical daughter cells D. provided a model for our understanding of cell structure