Studying the Sepia apama cuttlefish, Hanlon, Naud, and their colleagues observed that most success in producing fertilized eggs was attributed to the males guarding mated females from subsequent mating attempts by other males. What additional behavior contributed to successful production of fertilized eggs?
A. As opportunistic hermaphrodites, smaller males were able to mate and reproduce as females.
B. Smaller males distracted larger males for more than 40 minutes, past the viability of their sperm, and then the smaller males mated with the
females.
C. The sparse population density of Sepia apama cuttlefish results in lower but equal reproductive successes among smaller and less aggressive
males.
D. Smaller, less aggressive males used mimicry of females to approach guarded females repeatedly to mate.
E. All of the answer choices are correct.
D. Smaller, less aggressive males used mimicry of females to approach guarded females repeatedly to mate.
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A newly described fungal species has been isolated from the rumen of sheep. It is microscopic, unicellular, and produces spores that have a flagellum. This species will most likely be classified as a/an ________.
A. Chytridomycete B. Glomerulomycete C. Ascomycete D. Microsporidia E. Basidiomycete
The early atmosphere
a. was essentially the same as occurs now. b. was changed drastically by the liberation of oxygen following the evolution of photosynthesis. c. was characterized by high concentrations of oxygen and ozone. d. was characterized by high concentrations of inert gases before the evolution of living organisms. e. was so dense that life could not evolve.
Why can't you buy fern seeds from a garden supply store?
A) The seeds are extremely rare. B) Ferns do not produce seeds. C) Fern seeds must stay moist. D) Fern seeds do not survive long after they are produced. E) The seeds are too small to package.
Much research is being done to increase the nitrogen-fixing ability of plants with root nodules. Why is this an important goal for agricultural researchers?
A) Decreasing the size of nodules will allow plants to fix more nitrogen into their own molecules. B) Nitrogen is an essential component of the amino acids used to form protein. C) Increasing the nitrogen-fixing ability of plants will allow them to make better use of nitrogen fertilizers. D) Removing the bacteria from the root nodules will allow more fixed nitrogen to be available to the plants.