18.The average or small size stars become a at the end of their life cycle. a. Black hole
b. Neutron star
c. Black dwarf
d. White dwarf

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

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.

Element before carbon on the periodic table