Final answer:
In Biology, kin selection drives cooperation among closely related sperm to enhance their collective reproductive success by favoring shared genetic material.
Step-by-step explanation:
In the field of Biology, cooperation amongst closely related sperm in the context of sperm competition is driven by kin selection. This is because the related sperm share a significant percentage of their genetic material. Cooperation between these sperm increases the overall reproductive success of their shared genes, which is the essence of kin selection. It is a strategy where behaviors that help the reproduction of relatives and thus increase the overall genetic success of shared genes in a population are favored.