Answer:
Option a. is correct
Explanation:
A mutation refers to a change in our DNA sequence which causes it to break down. It occurs due to the following reasons:
1. Due to mistakes when the DNA is copied
2. Due to environmental factors such as UV light, smoking.
3. Exposure to specific chemicals or radiation
The mechanism for reactive oxygen species to cause mutation is that bases are oxidized to a variety of different products which might pair with a different base than the original base would have.
Latitude and ocean currents are the ones i know.
B is correct since trees absorb CO2.
Are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels around the sun
The central vacuoles contain little water