I feel the answer is cell membrane .
The cell membrane is a semipermeable protection and covering for the cell.
Please mark me as brainliest, if this helped.
I would say oxygen because respiration is breathing mechanically.
Answer:
dear user nitrogen fixation is so important bcoz of the reasons given above
Answer:
Option (3)
Explanation:
The continental crust is usually thick because it has an average thickness of about 35-40 km. In the high mountain ranges, it is the thickest, forming about 80 km on an average. These are formed when two continental plates form a sandwich pattern by sharing a convergent type of plate boundary.
For example, the thickest part of the crust is the Mt. Everest which lies in the great Himalayan range, which has started to form about 50 million years back. It is geologically the most recent mountain range.
The older mountains are continuously eroded in the geological past, as a result of which the height of the mountains is affected.
Thus, the correct answer is option (3).
DNA mutations create genetic variation.
They could have no visible effect, no affect at all or cause something to happen, e.g cancer, or genetic mutations in the gametes lead to genetic variation in offspring. They can also lead to genetic diseases, for example cystic fibrosis or Huntingtons disease
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