Hello!
A aquifer<span> names an underground area that collects and holds a large amount of water.
I know this because an aquifer collects water.
~ Hope I helped! ~
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Hello,
An increase in pollution [could] lead to a decrease in <span>genetic variation in a population of tuna.
Faith xoxo</span>
the answer is decomposition.
Crossing over does helps in genetic diversity as it provides with new genes combinations. In crossing over, chromatids exchange genetic information during the meiosis. This mixing of genetic information provides the offspring with its own unique genetic makeup with some similarities with the parent’s genetic system. Crossing over is very beneficial in terms of giving the offspring more variability that helps in becoming more resistant to a disease and be a better version than parents.
i think it is called the nuclear envelope, but I am not sure...
Hope this helped :)