In the late devonian era, the seas began to recede and the land became more fertile. these environmental changes resulted in the emergence of land-dwelling vertebrates. some animals are better able to survive and reproduce under changing environmental conditions. this is an example of: a. evolutionb. mutationc. speciationd. natural selectione. adaptation
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Biology, 21.06.2019 18:40
The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?
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Biology, 21.06.2019 20:00
Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.
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Biology, 22.06.2019 02:30
In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring
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Biology, 22.06.2019 04:00
Explain why the plants cortex would serve as the best food source for animals
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In the late devonian era, the seas began to recede and the land became more fertile. these environme...
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