Which of the following is an effect on the male reproductive system?

Abnormal sperm shape and transfer is indeed an effect on the male reproductive system, as it directly pertains to the quality of sperm, which is crucial for male fertility. Various factors can lead to abnormal sperm morphology and motility, including environmental factors, lifestyle choices, and health conditions. When sperm have an abnormal shape (asthenozoospermia) or impaired ability to move effectively (teratozoospermia), it can significantly impact a man's fertility potential and his ability to successfully conceive with a partner.

In contrast, while increased height, better eyesight, and lower attention span may influence overall health and well-being, they do not specifically correlate with changes or dysfunctions in the male reproductive system. These aspects are more related to genetics, nutrition, and lifestyle factors but do not indicate direct effects or alterations related to sperm health or male reproductive function.