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Sladkaya [172]
3 years ago
8

Throwback Question: Scientists theorize that it took a billion years or more for oxygen in the atmosphere to reach the levels of

today. Based on this idea, the first cells could be classified as which of the following?
1 point
aerobic
anaerobic
eukaryotic
protista
Biology
1 answer:
polet [3.4K]3 years ago
7 0

Answer:

anaerobic i think

Explanation:

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Natural selection doesn't favor traits that are somehow inherently superior. Instead, it favors traits that are beneficial (that is, help an organism survive and reproduce more effectively than its peers) in a specific environment. Traits that are helpful in one environment might actually be harmful in another.

(one again, I hope this helps ^^)

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The signs used depend on the species being surveyed and include the presence of runways and tracks on *
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(a). soft substrates

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Mobile organisms can be measured by both direct and indirect methods. Direct methods may involve observing the actual behavior (e.g., scoring via timing). Moreover, indirect methods are those where the technique used depends on the species being examined, collecting information such as through recording of tracks in the soft substrate (e.g., mud, sand, snow), presence of fur/feathers, droppings (mammals), etc. For example, indirect observation of insects may involve the determination of exoskeletons, sounds, etc.

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<h2>Fighting for Clean Air in our National Parks</h2>

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<h2>Defending Federal Laws and Regulations </h2>

The Clean Air Act – which has helped improve air quality throughout the nation and the National Park System – is now under consistent threat as the Environmental Protection Agency works to roll back regulations, attack the use of science and offer polluters loopholes. NPCA advocates to defend and strengthen the clean air laws that protect park skies. We speak out for science and guard against policies driven only by politics and private industry.

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Picture park skies free of pollution. While this sadly isn’t the case today, NPCA strives to make sure that parks are on the right track and that air pollution harming parks is reduced. We do this by helping to secure strong state plans to limit haze-causing and climate-altering pollution, and by defending existing plans – in court, if necessary.

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Clean air laws are meaningless if polluters and the government don’t follow them. NPCA vigilantly monitors for sources that violate their permits or when officials aren’t following through on the safeguards in place to protect parks. We also look for opportunities to collaborate and work in state, local or regional processes to prevent threats of new pollution and help reduce harmful emissions. Learn about our work in California and Utah.

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