"An oxygen-rich environment would cause a mass extinction of prokaryotes." Supports current scientific theories of how life might have originated on Earth.
<u>Explanation:
</u>
The reacting power of oxygen increases rigorously in an oxygen- rich environment, which leads to huge fireignition even with the slightest spark which is generally non hazardous at all. Many prokaryotic organisms do notneedoxygen as they performanaerobic respiration. Oxygen is dangerous for some prokaryotes.
There were some prokaryotic organisms who were givingoutoxygen as waste. Such excess amount of oxygen was hazardous for the environment and hence mass extinction was required to keep a check on the excess amount of oxygen being released.
The answer is LH only.
Luteinising hormone promotes the release of an egg
from an ovary during ovulation. Follicle Stimulating Hormone, on the other hand, stimulates
the maturation of ovarian follicles. When its levels
drop and LH surge, ovulation of a mature
egg from the mature follicle occurs.
