What is it called when members of each species compete regularly for food and other necessary resources?

This is called interspecific competition.

Here's a breakdown:

* Interspecific means "between different species".

* Competition refers to the struggle between organisms for the same resources, like food, water, shelter, or mates.

So, interspecific competition occurs when members of different species vie for the same limited resources. This can lead to various outcomes, such as one species outcompeting the other, or both species adapting to use different resources.