Answer:
I believe it is D.
Explanation:
Ecological succession has to do with how the habitat changes over time. So D would make the most sense.
Answer:
Gut Microbiome
Explanation:
This is home base for the bacteria in your digestive tract. Here, they help you break down food and turn nutrients into things your body can use. They stop growing when they run out of food, so you'll only have what you need.
