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experiments conducted by louis pasteur disproved the concept of
spontaneous generation. what does spontaneous generation mean?
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a. nonliving things can produce living things.
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b. new cells come from preexisting ones.
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c. living things can mutate into new species.
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d. living things can pass their traits to their offspring.
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Which statements are true of a scientific theory but not a hypothesis

Put the following steps of the convection process in the correct order. 1. gravity pulls cooler matter downward. 2. the matter expands and decreases in density. 3. an up-and-down flow of matter produces a convection current. 4. matter is heated. 5. warmed matter is forced upward. question 2 options: a) 4, 2, 5, 1, 3 b) 2, 4, 3, 1, 5 c) 3, 2, 5, 4, 1 d) 1, 4, 2, 5, 3

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.