(blank) is the state of maintaining a stable internal environment despite changing external conditions. *homeostasis*

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.

What process decreases the salinity of ocean water? decreased precipitationdecreased melting of glaciersincreased evaporationincreased runoff from rivers