Answer:
A
Explanation:
Organisms on Earth use nitrogen to build proteins necessary for cell
development.
Answer:brain
Spinal cord
Explanation: the two make up the nervous system
Dividing a cell into more than one cell is called splitting.
The process is known as the greenhouse gasses effect
There are many lines of evidence which clearly show that the atmospheric CO2<span>increase is caused by humans. The clearest of these is simple accounting - humans are emitting CO2 at a rate twice as fast as the atmospheric increase (natural sinks are absorbing the other half). There is no question whatsoever that the CO2 increase is human-caused. This is settled science.</span>