by, and make sense of, many observations. Which of the following statements best describes theories?
A. They are supported by, and make sense of, many observations.
B. They are nearly the same things as hypotheses.
C. They cannot be tested because the described events occurred only once.
D. They are predictions of future events.
A. They are supported by, and make sense of, many observations.
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Ichthyosaurs were extinct aquatic reptiles distantly related to living lizards. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are
A. homologous. B. adaptations to a common environment. C. examples of convergent evolution. D. Three of the responses above are correct. E. Two of the responses above are correct.
2nd law of thermodynamics
What will be an ideal response?
Carrying capacity can be reduced with an increase in
A. energy. B. raw materials. C. space. D. waste products.
Wetlands purify water by removing sediments and pollutants
Indicate whether the statement is true or false