Which of the following series correctly represents the hierarchical organization within ecology?
a. ecosystem ? population ? community ? biosphere
b. biosphere ? community ? population ? ecosystem
c. community ? population ? ecosystem ? biosphere
d. population ? community ? ecosystem ? biosphere
e. population ? ecosystem ? community ? biosphere
D
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It is believed that HIV has passed from chimps to humans more than once. This suggests that animal-to-human viral transmissions may be more common than previously thought
What is the best evidence in support of the conclusion that HIV made the chimp-to-human leap more than once? A) HIV has multiple strains, and the virus does not appear to be able to leap from humans back to chimps. B) HIV has appeared on multiple continents. C) Human-to-human transmission of HIV requires direct personal contact that simply could not have resulted in the widespread outbreak we see today. D) Several species are known to have similar viruses resulting in immunodeficiency diseases.
When two atoms share a pair of electrons, the bonding is referred to as:
A. ionic. B. covalent. C. unstable. D. hydrogen.
A Chi-squared test is used when the independent and dependent variables are
A. Continuous and Continuous B. Continuous and Discrete C. Discrete and Discrete D. Discrete and Continuous
In chloroplasts, the process that occurs at the electron transport chain leads to:
a) the diffusion of electrons through the thylakoid membrane. b) the reduction of NADPH. c) the movement of water by osmosis into the stroma from the thylakoid space. d) the reduction of water to produce ATP energy. e) the establishment of a proton gradient.