What term describes a pure substance that is made up of only one type of atom? matter, rock, compound or element?

Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Which short-term environmental change is most likely to lead to ground shifting, landslides, and the collapse of buildings or roads? forest fires flooding earthquakes

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.