Astronomers think planets formed from interstellar dust and gases that clumped together in a process called

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.