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Creating new things to solve problems and improve life depends on the close interaction of which two fields?
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Internal gestation followed by live birth is an evolutionary development most likely driven by which of the following? a. the inability of eggs to acquire nutrients to grow complex animals b. the need to give birth and reproduce on dry land where eggs could dry out c. the threat of predators to eat eggs d. environmental conditions caused eggs to over-absorb dangerous molecules from the environment
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Index fossils are a. fossils that are found in limestone. b. relatively rare and difficult to find. c. imprints of organisms known to have lived during a specific time period. d. fossils of species that still exist today.
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