The majority of oxygen in earth's atmosphere is a product of photosynthesis by ________.
A. agricultural lands
B. green plants
C. rain forests
D. microorganisms
Answer: D
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Analyzing DNA sequences in different populations provided us with what new information?
A. that the bonobo and chimpanzee are two different species B. that the gorilla is more closely related to humans than the orangutan C. that the chimpanzees are more closely related to humans than gorillas are D. that Old World monkeys are separate from the Apes E. None of the answer options is correct.
Explain why geneticists believe that almost all chromosomally abnormal embryos and fetuses are eliminated as
pregnancy progresses. What will be an ideal response?
Estimates of earth's carrying capacity for humans vary from about 0.6 billion to several tens of billions.
a. true b. false
A(n) ________ is a separate group of organisms incapable of interbreeding with other such groups.
Fill in the blank(s) with the appropriate word(s).