The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior affects ________
A) the direct fitness of the caller
B) the indirect fitness of the caller
C) both the direct and indirect fitness of the caller
D) neither the direct nor indirect fitness of the caller
C
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Red tides are caused by
a. formaniferans. b. dinoflagellates. c. many different organisms from many different classification groups. d. sea weeds. e. ciliates.
Retired football players are _____ times more likely to die of neurodegenerative brain damage than the general public
a. three b. four c. five d. six e. ten
Genetic evidence has revealed that H. sapiens diverged from _____________________ 100,000 years ago, while
Neanderthals diverged from this species 300,000 years ago, suggesting that modern humans did not descend directly from Neanderthals. Fill in the blank(s) with the appropriate word(s).
Mom and dad come to you, their doctors, and report no dirty diapers after feedings. Their now 3-day-old baby isn't pooping, and they feel something is wrong. Which of the following reasons could possibly explain this?
a. The baby hasn't eaten enough. b. There is a blockage somewhere in the baby's digestive track. c. The baby has no bacteria in its gut. d. The digestive enzymes in the gut are not functioning properly.