Lots of hand waving as is in the current field of much of molecular biology. Other than that experiments and observations. Basically the utilization of the scientific method and then trying to find the mechanism by which something occurs through even more research/experimentation.
HOPE THIS HELPS
Answer:
Every hour 3 species disappear. Every day 150 species are lost.
There are many different sources of carbon!
Some of the following can be of those sources:
Fossil fuel
Carbon dioxide
Natural gas
Coal gases
Petroleum
There are others but I hope this is enough. Good luck! :)
The correct answer is c. muscularis mucosa.