Based on your investigation, what challenges do scientists face when classifying a new fossil?

Acommon kind of mechanical weathering is called

This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water