In an analysis of independent contrast, researchers found that fetuses had faster growth rates in polyandrous than in monogamous species of primates. How did the researchers interpret the results?
a. Fetuses develop faster to "make room" for offspring from a different male.
b. Extracting more resources from the mother maximizes offspring's inclusive fitness in polyan-drous species.
c. Fast fetal growth rates are always optimal.
d. Fetal growth rates represent phylogenetic constraints and are unrelated to mating system.
B
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An F1 organism is always homozygous
Indicate whether the statement is true or false.
What characteristic is common to most chordates, but is not a necessity?
a. Vertebrate b. Pharyngeal gill slits c. Postanal tail d. Notochord
Australopiths show a trend toward improved upright walking, smaller teeth, and greater hand dexterity. Like other early hominins, they retained a ____
a. vertically split upper lip b. a skull that opens to the spinal cord at the rear c. modern human sized brain d. chimpanzee-sized brain e. a prehensile tail
When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of
A) density-dependent regulation. B) exotic regulation. C) ecosystem carrying capacity. D) density-independent regulation. E) community carrying capacity.