Final answer:
It is true that interactions within the same species involve both competition and cooperation, balancing selfish and altruistic behaviors, which are essential in biological systems.
Step-by-step explanation:
It is true that interactions among members of the same species balance cooperation and competition, altruism and selfishness. These interactions are crucial in maintaining biological systems. Within a species, competition for resources can drive individuals to act in their own self-interest; however, cooperative behavior can lead to more efficient use of energy and matter, thus benefiting the group as a whole.
Altruism, a form of cooperation where an individual's actions benefit others at a cost to itself, can also occur within species. On the other hand, selfishness is often seen in the pursuit of individual advantage, for example, obtaining food or mates.