Why is it so important to avoid pollution of freshwater ecosystems? a. freshwater ecosystems contain more species than marine ecosystems contain. b. freshwater ecosystems are the source of most of our drinking water. c. there are more freshwater ecosystems than there are marine ecosystems. d. freshwater organisms are more important than marine organisms are.

The answer is B because it literally says it right there, and I don't wanna make it impossibly confusing for a middle school student, lol.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.