Key issue 3 why does population growth vary among regions answers

The population growth vary among regions because of the different conditions and life sources. On the example of human population, we can conclude that population growth is related to economic development and that the death rates fall due to improved conditions.

the animal that would be cutest if scaled down to the size of a cat? elephant

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