Answer:
Commensalism is a long-term biological interaction (symbiosis) in which members of one species gain benefits while those of the other species neither benefit nor are harmed.
Explanation:
Most enzymes' optimum pH is neutral or close to neutral, like amylase found in saliva, which has an optimal pH = 6.8. Some enzymes prefer a more drastic pH, like pepsin, which can have an optimum pH of 1.7 to 2. Sometimes enzyme pH optima depends on where the enzyme is found.
To produce hormones and also to produce electrical impulses
Hadean is the first eon of precambrian, and took place around 4.6 and 4.0 billion years ago.
Characteristics of Living Creatures
1. Move
2. Eat
3. Sensitive to Stimuli
4. Breathe
5. Grow
6. Dispose of Waste
7. Reproduction
8. Adapt