Answer:
This is great because in a changing eviroment (needing to change if they want to survive) they may reproduce sexually for genetic diversity, whereas if they are already well adapted to the area it is possilbe for them to pass on ALL of the traist that allowed them to survive in the first place.
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B) No, many microorganisms, like those in your gut, are beneficial
As is turns out there are only about 100 different bacteria which are pathogenic. All other bacteria are completely harmless and, as this question states, some are crucial for proper human health as we exist in a symbiotic relationship with them. Bacteria in the large colon provide nutrients to us, and play an important role in the development of the immune system.
Yes because more of them are gone
A. mass, volume.
Remember this:
A heart split in half: The top resembles an M while the bottom resembles a V
That's mass over volume
Hope this helps! <3