At the very end of a small or medium sized stars life cycle, after it has become a red giant what happens to the star?

a. it becomes a supernova
b. it becomes a white dwarf star.
c. it becomes a black hole.

Why do bacteria thrive even in hostile environments

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers