Answer:
Oxygen levels stay above 15 percent starting 200 million years ago
Explanation:
Atmospheric oxygen levels are related to the evolution on Earth and changes in geochemical cycles that involve climate variations.
The presence of O
2 and evolution of oxygen gave new opportunities to the life on Earth. Oxygen levels in atmosphere have fluctuated between 15% and 35% of atmospheric volume, since the start of the Cambrian period.
So, form the starting 200 million years ago, oxygen level stay above 15 percent and the correct option is "B".
Clear cutting means most – or all – of the trees in a given area are cut down. In selective cutting, only selected trees are cut, leaving the rest of the stand ...
I'm not for sure but I think its C.
I don't think 0.01 kilo of salt would make much difference, but I'm not positive.
sorry.
Answer:
Meiosis is the process by which one diploid eukaryotic cell divides to generate four haploid cells often called gametes.
<em>Hope this helps</em>
<em>-Amelia The Unknown</em>
