Explanation:
because if they were still alive today then our species would be endangered
Both process involve changes in energy and matter
The first step of chemical digestion starts in the mouth. Saliva, the fluid released by the salivary glands in the mouth, contains an enzyme that breakdowns food starch and turns it into simple sugars. This enzyme is called amylase or also known as alpha-amylase or ptyalin.
Rain shower. The pressure from the barometer predicts likely precipitation, and as snow doesn't form until 32F, rain is the most likely.