Describe the two different circulatory systems found in mollusks.

What field of science did harry hess study?

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

What is the inability of an individual or a society to achieve a minimum standard of living known as ?