Ocean and freshwater contamination
a. does not affect marine life
b. is not affected by agriculture
c. results from industrial activity
d. is independent of human activity

c. results from industrial activity 

Many ocean and freshwater are contaminated and affected by pollution due to the ongoing factories and industries that disposes their wastes and other harmful chemicals around bodies of water which has extreme adverse effects to both nature and people.

For the first question, the answer would be the same as 1.83 * 100,000 (10^5, or 1 + 5 zeroes appended). This would give a result of 183,000. For the second part, the answer would be the same as 5 * 10,000,000,000 (10^10, or 1 + 10 zeroes appended). This gives a result of 50,000,000,000 (50 billion).