determine the total pressure of a gas mixture that contains oxygen at a pressure of 150 mmHg, nitrogen at 350mmHg, and helium at 200 mmHg

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.

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

Compare and contrast refraction of light and sound will give brainliest