Which of the following hormones aids in the maturing of sperm and causes many changes in the male body?

Testosterone is the hormone responsible for the maturation of sperm and the development of male secondary sexual characteristics. It plays a crucial role in male reproductive health by promoting sperm production in the testes. Additionally, testosterone influences various physical changes in the male body, such as increased muscle mass, deeper voice, and the growth of facial and body hair. This hormone is essential for the overall development of male sexual organs and characteristics during puberty and continues to maintain these functions throughout adulthood.

In contrast, the other options do not fulfill this role; estrogen and estradiol are primarily associated with female reproductive functions, and a zygote refers to the early stage of development after sperm fertilizes an egg, rather than a hormone. Therefore, testosterone is clearly the hormone that aligns with the maturation of sperm and changes in the male body.