In his theory of evolution, darwin was unable to account for

He was unable to explain the genetic basis for variation in a population.

feral cats are estimated to eat tens of millions of native animals each night in australia

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