Which element is a halogen?

argon
bromine
calcium
lithium

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Animals that reproduce sexually either do it through external or internal fertilization. read the following statement and decide if it is true or false. birds reproduce through external reproduction which is because the female will then be able to protect the egg.

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.