The black rods in this image are single-celled organisms found in a pond. Which scientist was the most likely to observe this organism under the microscope first?

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.