Which material maintains the digestive environment in the stomach?
a strong bases
b weak bases
C strong acids
d weak acids

4. how does a phospholipid behave in water? the phosphate head does not mix with water; the fatty acid tails do. the phosphate head and the fatty acid tails mix with water. the phosphate head and the fatty acid tails do not mix with water. the phosphate head mixes with water; the fatty acid tails do not.

What are some characteristics of a free enterprise economy?

9. the history of life on earth is recorded in