Gases in both Earth's atmosphere and oceans have changed over its history. Scientists noted oxygen spikes in both the oceans and the atmosphere that coincide with changes in species on Earth. They report that the first oxygen spike resulted in a change from the microscopic life forms of 635 million years ago to large algae around 551 million years ago. A second oxygen spike occurring around 550 and 542 million years ago, according to the fossil records, resulted in an increase in
A) life to land.
B) marine animals.
C) mammal species.
D) vascular plants.
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Biology, 21.06.2019 17:30
Charles darwin published his theory of evolution in 1859. in what way foes modern evolutionary theory differ from the theory as proposed by darwin? a) darwin inferred that individuals can evolve, but modern generic science has shown that this is not true. b)darwin inferred that individuals do not evolve, but modern genetic science has shown that this is not true. c)modern science has disproved most of darwin's original theory of evolution, because darwin knew nothing about generations and their role in heredity. d)generic studies have shown that gene expression and other factors operate along with natural selection, but most of darwin's theory has been supported by modern science.
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Biology, 22.06.2019 04:30
Quick asap will give brainiest ! what best describes the same pattern of tides on earth throughout the day? neap tides spring tides semidiurnal tides nocturnal tides
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Biology, 22.06.2019 05:30
Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.
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Gases in both Earth's atmosphere and oceans have changed over its history. Scientists noted oxygen s...
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