Answer:
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population. Because of this, mutations are usually selected against through evolutionary processes.
Explanation:
The number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.
<h3>What is a resistor?</h3>
In an electronic circuit, a resistor is an electrical component that limits or regulates the flow of electrical current.
Given, the resistance is 20 ohms.
The potential difference is 30 volts
Time is 10 minute
By the formula of current

The charge flowing through the resistor is 1.5 C/s
1 electron charge is 1.6e+19
Now, the number of electrons passing through a 20 ohms resistor is

In 10 minutes

Thus, the number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.
Learn more about a resistor
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D logistics and Inventory Control
The answer would be new theories come up and are replaced by the older inaccurate theories. Obviously this theories are checked by scientists over and over and over again to see if they can make it more accurate and better.