The phrase to fit into the blank is "sexual reproduction"!
In sexual reproduction each of the parents produces a gamete and contributes to half of the offspring's genes. This means that the offspring is a unique composition of the two parents.
In contrast, in a asexual reproduction, the offspring would likely have the same genetic code as the parent.
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Increase, the radius is half the diameter. So if the diameter increases so will the radius.
IDK THE OPTIONS BUT IM GONNA GUESS SPEEDING OR ROAD RAGE IDK