Final answer:
An example of two organisms competing for energy is a lion and a hyena competing for prey. Another is two oak trees vying for sunlight and nutrients. This showcases interspecific and intraspecific competition respectively.
Step-by-step explanation:
The question asks to name two organisms that are competing for energy and explain how they compete. An example of this could be a lion and a hyena, as they sometimes compete for the same prey in the African savanna. This competition is typically interspecific, meaning it occurs between different species.
Another example is two oak trees growing in close proximity in a forest. They compete for sunlight, water, and nutrients from the soil. This is intraspecific competition, as it occurs between members of the same species. The tree that is better able to grow taller and spread its roots more efficiently will generally have greater access to these resources and therefore be more likely to thrive.
These interactions exemplify the ecological principle that living organisms must contend with one another to secure the limited resources necessary for survival.