The shark and remora have a relationship that benefits the remora but neither helps nor harms the shark. What type of relationship is this? commensalism
or
predation
or
mutualism
or
parasitism

The boiling point of liquids is very high what does it indicate

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.