What is a substrate?
a.) a molecule that changes state
b.) a place where the reaction occurs
c.)
d.) a reactant that is catalyzed by an enzyme

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.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).