Hey I can help! I'm taking the course right now. What is the question?
Answer:
There are many different systems involved in when we exercise, the three main ones are the Respiratory system which is involved in breathing the circulatory system which is about circulation of blood around the body and finally the muscular system and finally the Muscular system which is about how we move.
The answer is D. two birds of the same or different species living in the same area
<span>Competition is an interaction between members of the same species or between different species living in the same area. If resources, such as food, water, sunlight, territory, are limited and several species depend on these resources, then, they must compete with the same or other species to gain the resources. </span>