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IrinaVladis [17]
3 years ago
6

The yearly rise and fall of CO2 levels in the atmosphere are

Biology
1 answer:
Elena L [17]3 years ago
7 0
Seasonal use of fossil fuels, human activities are changing the natural greenhouse. Over the last century the burning fossil fuels like coal and oil has increased carbon dioxide in the atmosphere.
Hope this helps!!
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Explain two ways that carbon returns to the atmosphere from animals.
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Organisms return carbon<span> dioxide to the </span>atmosphere<span> by respiration. It is not just </span>animals<span> that respire. Plants, algae and microorganisms do too. </span>Carbon<span> dioxide is also released into the </span>atmosphere<span> when fossil fuels such as coal and oil, and wood, are burned. hope this helps</span>
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What is love and hhhh ghhh
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No clue what hhhh and ghhh means:)
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3 years ago
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Mechanisms enabling one cell to influence the behavior of another almost certainly existed in the world of unicellular organisms long before multicellular organisms appeared on Earth. Evidence comes from studies of present-day unicellular eucaryotes such as yeasts. Although these cells normally lead independent lives, they can communicate and influence one another's behavior in preparation for sexual mating. In the budding yeast Saccharomyces cerevisiae, for example, when a haploid individual is ready to mate, it secretes a peptide mating factor that signals cells of the opposite mating type to stop proliferating and prepare to mate (Figure 15-2). The subsequent fusion of two haploid cells of opposite mating types produces a diploid cell, which can then undergo meiosis and sporulate, generating haploid cells with new assortments of genes.

Explanation:

Brainliest please?

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What would happen to a woman astronaut who tried to walk on mars without a spacesuit or helmet?
Zina [86]

It would be slightly worse than taking it off in space. The atmosphere on the surface of Mars is nearly a vacuum, so the astronaut would do well to notice the boiling saliva and tears and reseal the helmet immediately. Failing that, he or she would pass out in a few seconds, which is perhaps just as well. In space, you can only cool off by evaporation or by radiating infrared into space. On Mars, the tenuous air is just barely thick enough to conduct heat, and it’s generally colder than northern Siberia in the January. So…yeah. Don’t do that.


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3 years ago
What conditions created the numerous fossils that make up the Burgess Shale?
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The Burgess Shale is a rock formation that is known for having an abundance of soft bodied organisms preserved in shale. This formation is significant because it preserves organisms from the Cambrian Explosion. The Cambrian Explosion is a period in time that coincides with the Pre- Cambrian- Cambrian boundary around 542 million years ago. The period represents an unusually rapid radiation of organisms. 
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