Which applies to the collision theory?
a. particles need to collide in order to react.
b. particles may obtain successful collisions in any molecular orientation.
c. temperature increase causes kinetic energy of particles to decrease.
d. reactions do not have to begin with collision of molecules or particles.?

Ayoung boy has been found and police are trying to locate his family they take a dna sample from him and begin collec dna samples from families who have missing children if police use dna samples only from the fathers, which type of dn technology can they use to identify the boy's parent? y-chromosome analysis omtdna (mitochondrial dna) analysis vntrs (variable tandem repeats) o pcr (polymerase chain reaction) analysis