Why does non-point source pollution have a greater impact on our waterways than point source water pollution?

Could someone me with number one you

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.

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation