A population of grasshoppers in the Kansas prairie has two color phenotypes, green and brown. Typically the prairie receives adequate water to maintain healthy green grass. Assume a bird that eats grasshoppers moves into the prairie. How will this affect
the natural selection of grasshoppers? How might this change in a drought year?
What will be an ideal response?
In normal years, green grasshoppers would be selected because of protective coloration, and as generations come and go, green will predominate. In drought years, brown will be selected for its protective coloration, and the next generation will have more brown grasshoppers than the previous generation.
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Imagine that you have two people using breathing gear under water. Diver 1 is using an old style "rebreather" that removes carbon dioxide before the mixture is "rebreathed" and therefore decreases overall carbon dioxide concentrations in the blood. Diver 2 is using regular SCUBA gear and is breathing air with the normal amount of carbon dioxide that does not lower blood levels of carbon dioxide.
Which diver would have a higher blood pH and which would feel more an "urge to breathe"? A. Diver 1 would have higher blood pH and would feel the "urge to breathe" sooner. B. Diver 2 would have higher blood pH and feel the "urge to breathe" sooner. C. Diver 1 would have higher blood pH, while Diver 2 would feel the "urge to breathe" sooner. D. Diver 2 would have higher blood pH, while Diver 1 would feel the "urge to breathe" sooner. E. There would be no difference in blood pH or breathing between the two divers.
Although most hormones work at sites distant from where they are secreted, some work locally, such
as a. follicle stimulating hormone. b. prostaglandin. c. luteinizing hormone. d. thyroid stimulating hormone. e. adrenocorticotropic hormone.
A horizontal branch in an evolutionary tree indicates
A. gradualism. B. punctuated equilibrium. C. extinction. D. convergent evolution. E. temporal isolation
Marine Biology can best be described as:
What will be an ideal response?