Question

Which is not a major similarity or difference between freshwater and marine ecosystems?

a. both support a large number of plants and animals adapted for aquatic living
b. ocean and freshwater system conditions generally remain constant throughout the year
c. freshwater ecosystems have a very low salt concentration, and include ponds, lakes, streams, wetlands, and rivers
d. saltwater ecosystems have a high salt concentration and include oceans, coral reefs, and estuaries

Answer 1

THE CORRECT AND ONLY ANSWER IS B.

Answer 2

The correct answer is b. ocean and freshwater system conditions generally remain constant throughout the year. This is not true because they are very different. For examples, freshwater rivers can completely freeze during the winter while oceans can't freeze completely, not even a bit. Also, the animals inside have completely different body structures to fight these changes.