What organism would be at the second level in a detrital food web?
A. leaves
B. shrews
C. detritus
D. earthworms
E. birds
Answer: D
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Unsaturated fatty acids are those containing carbon-carbon ________ bonds.
Fill in the blank(s) with the appropriate word(s).
Species Pairs Percent Divergence in a
Selected DNA Sequence Human?chimpanzee 1.7 Human?gorilla 1.8 Human?orangutan 3.3 Human?gibbon 4.3 Human?rhesus monkey 7.0 Human?spider monkey 10.8 Human-tarsier 24.6 . Based on data in the accompanying table, which of the primates listed below is the most distantly related to humans? a. gorilla b. gibbon c. orangutan d. chimpanzee e. rhesus monkey
Which statement about natural selection is true?
A. It can have an evolutionary effect only if phenotypic differences are heritable. B. It is the same as evolution. C. It acts directly on genotypes. D. Changes in allele frequencies can occur only because of natural selection. E. It always results in reduced genetic variation.
Imagine a newly discovered biological molecule that is mostly hydrophobic in its structure. How would this new molecule be classified?
What will be an ideal response?