The best and most correct answer among the choices provided by the question is the fourth choice "<span>Crossing over during metaphase allows segments of DNA from 2 parents to SWAP and produce non-identical haploid cells."</span><span>
</span>Mutations are changes in the DNA. A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations. Gene<span> flow is any movement of </span>genes<span> from one population to another and is an important source of</span>genetic variation<span>.</span>
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Answer:
In mathematics it is used for dividing a number, whereas in science it is element which helps in proving certain effects. So they are different for different subject.
Explanation:
In mathematics factor is to break or divide in to numbers which can be further multiplied to get the actual number. Example 6 = 3 
2. here 2 and 3 are factors of 6. But when it comes to science factors are the elements that contributes something to result. It may be in controlled environment or naturally occurring one. The lab experiments are basically done in the controlled environment to check the factor effect over the experiment.
<span>A) similar evidence collected in multiple experiments by different people
Hope this helps!</span>
Explanation:
HIV virus is an RNA virus
