Affects populations,
Occurs when there is genetic variation
Selects organisms with certain traits to survive.
Nitrogen I believe . I need 20 characters.
The first pesticides relied on natural chemicals, such as those taken from chrysanthemum flowers is true
Their weights could be different.
Their volumes could be different.
Their densities could be different.
The volume for an ounce of lead is much different than an ounce of aluminum.
the weight of a cubic meter of balsa wood is much different (and much lighter) than a cubic meter of water. That's why the ancients used balsa for their rafts.