In the following scenario what is the independent variable? Alex and Cassie both bought two toy cars from the store. They want to see which
car has more kinetic energy. So they rolled the cars first slow into a ball of
clay and then they rolled the cars fast into a ball of clay. The fast car made
more of a squish.

the answer is 1 i believe

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.