Final answer:
Intersexual competition involves varying energy investments by males in different species, with some focusing heavily on courtship that reduces energy for offspring care while others retain more energy for potential parental roles.
Step-by-step explanation:
In intersexual competition concerning energy investiture in offspring, different strategies can be observed across species. For instance, some males may exhibit energy-intensive courtship behaviors to attract females, while others may present secondary sexual characteristics like colorful plumage with less energy expenditure. When males of certain species invest heavily in attracting mates, this reduces the energy available for other vital functions, such as caring for offspring or even basic survival. On the other hand, males that use less energy in the mating process may have more energy reserves to provide care for their offspring or enhance their own survival. Natural selection plays a critical role in this balance, influencing traits and behaviors to maximize reproductive success and gene propagation.