Why might changes to an environment cause an organism’s population to decrease?

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 was bohr’s contribution to the planetary model

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy