Evolution is not a thing god made humans <3
Other lifestyle factors, such as sleep, stress, and exposure to toxins from our environment can affect our microbiome too.
The atmosphere is the answer
Hope I helped you
Wind, because the others can be completely used up at some point whereas wind will theoretically always be blowing
to classify it as a protostome, zoologist must see for the mouth development in the embryo.
Explanation:
The protostome are the animals which are unique to their three germ layer in embryonic development, with the bilateral symmetry as they have the ability to fly with other protostome developments.
the one characteristic feature to distinguish them as the protostome, mouth part development is to be sought as the mouth develops but not the anus in the embryo. the mouth parts serves unique to the group and their feeding structures.