Biology, 19.10.2019 22:30, zubeenakhtar1386
Mass extinctions occurred 250 million years ago and 65 million years ago. according to some scientists, which of the following reasons caused both mass extinctions? the earth’s oceans changed a few degrees in temperature. the diversity in the gene pool decreased dramatically. a new species was introduced into an established ecosystem. a large comet or asteroid hit the earth.
Answers: 3
Biology, 21.06.2019 17:40, danielamadrid79
Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than
Answers: 2
Biology, 22.06.2019 06:30, lambobacon9467
Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16
Answers: 3
Mass extinctions occurred 250 million years ago and 65 million years ago. according to some scientis...
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