All arthropods have similar nervous systems. what are the components of an arthropod's nervous system?
a. brain and spinal chord
b. tracheae and spiracles
c. brain, nerve chord, and ganglia
d. notochord and pharyngeal slits

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products