What do some bats use to locate food and to navigate?

This leaf-nosed bat uses sound waves and echoes--a technique called echolocation--to capture prey, such as crickets. Bats are a fascinating group of animals. They are one of the few mammals that can use sound to navigate--a trick called echolocation.     hope this helps  :3

for connexus the answer is : B

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.