Which applies to the collision theory? Particles need to collide in order to react.
Particles may obtain successful collisions in any molecular orientation.
Temperature increase causes kinetic energy of particles to decrease.
Reactions do not have to begin with collision of molecules or particles.

In order for a collision to be successful by resulting in a chemical reaction, A and B must collide with sufficient energy to break chemical bonds. ... This minimum energy with which molecules must be moving in order for a collision to result in a chemical reaction is known as the activation energy.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.