A runaway car without a driver crashes into a large tree and stops. The car is severely damaged, but the tree is not. What can you conclude about the relative strength of forces in this collision?

Chromosome 17 is made of over million base pairs.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron