In The Origin of Species, Darwin argued that the mechanism of descent with modification was ________.
A. artificial selection
B. natural selection
C. bionomial nomenclature
B. natural selection
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The fact that Salmonella has a high ID50 means that
A. it is more pathogenic than 50% of all gut microbes. B. an antibiotic dose of 50 ?g/ml can be expected to kill the organism. C. the most stringent decontamination measures must be used in food preparation facilities. D. consuming just a few cells of Salmonella will not result in illness.
The range of all factors that influence whether
a species can obtain resources essential for survival and reproduction is its a. habitat. b. niche. c. carrying capacity. d. ecosystem. e. community
What legal restrictions on the use of PGD are in place in the United States?
A. It has been banned across the board. B. It can only be used to prevent implantation if the disease diagnosed has a 100 percent chance of occurring with the genotype revealed. C. It cannot be used for sex selection. D. It cannot be used for screening embryos to be tissue donors. E. None of these are legal restrictions currently in place in the United States.
Tropical rain forests typically have a thick layer of litter on the forest floor
Indicate whether the statement is true or false