An advantage of sexual reproduction is to ____ among offspring.
A. produce new gene combinations
B. reduce genetic diversity
C. introduce new genes into a species
D. None of the choices is correct.
A. produce new gene combinations
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Which statement best describes the value of fungi in the environment?
a. Fungi "fix" nitrogen from the air for use by plants. b. Fungi trap sunlight energy in the form of carbohydrates. c. Fungi release elements from organic matter. d. Fungi enrich the soil by decreasing the rate of decay of organic matter. e. Fungi remove toxic metals from the soil.
The most aggressive form of lung cancer is
a. squamous cell carcinoma. b. small-cell carcinoma. c. adenocarcinoma. d. large-cell carcinoma. e. mesothelioma.
A small part of the human Y chromosome contains the gene that is responsible for determining maleness. What is the name of this gene?
What will be an ideal response?
Nesting geese will roll softballs (placed next to their nests by biologists) into their nests, perhaps because the balls resemble eggs that might have rolled out of the nest. This behavior is most likely
A) insight learning. B) conditioned. C) innate. D) habituation. E) trial-and-error learning.