The interaction in which one species benefits
and the second species is neither harmed nor
benefited is
a. mutualism.
b. parasitism.
c. commensalism.
d. competition.
e. predation.
C
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Extracellular molecules activating membrane proteins that in turn activate molecules inside the cell that control differentiation is an example of signal ____
Fill in the blank with the appropriate word.
You've likely heard of polar bears (Ursus maritimus) and grizzly bears (Ursus arctos horribilis). Have you hear of a grolar bear or a pizzly bear? These might be unfamiliar because they are the offspring of matings between polar bears and grizzlies
A handful of these animals have been born in zoos; three have been documented in nature. Due to their rarity, only a few grolars (grizzly dad and polar bear mom) or pizzlys (polar bear dad and grizzly mom) have been studied in detail. Their fur color, head shape, and ear shape are striking intermediates between the phenotypes of their parents. It is thought that polar bears originated from a population of brown bears (Ursus arctos) that became geographically isolated during a glaciation event that occurred about 150,000 years ago (Lindqvist et al., 2010). Traditionally the territories of grizzly bears and polar bears did not overlap, as grizzlies ranged from Alaska to Mexico, whereas polar bears stayed on the annual sea ice over the Arctic continental shelf and within the Arctic archipelagos. Relatively recently (last 50 years or so) grizzlies and polar bears have begun to come in contact in the wild. References: Lindqvist, Charlotte; Schuster, Stephan C.; Sun, Yazhou; Talbot, Sandra L.; Qi, Ji; Ratan, Aakrosh; Tomsho, Lynn P.; Kasson, Lindsay et al. (2010). Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear. PNAS 107 (11): 5053-5057. doi:10.1073/pnas.0914266107. PMC 2814953. PMID 20194737. The origin of polar bears was the result of A. allopatric speciation. B. sympatric speciation. C. peripatric speciation.
Assuming there are still 100 individuals in the Florida panther population, about how much genetic diversity do you expect to be lost by genetic drift in 10 generations?
A. A little more than 10% B. A little more than 5% C. A little more than 1% D. A little more than 50% E. A little more than 15%
Sebaceous glands are also known as
a. sweat glands. b. tear glands. c. digestive glands. d. oil glands. e. endocrine glands.