Which of the following is true of agroecology?
a.It refers to agriculture practiced on a small scale using individualized approaches that vary with local conditions so as to minimize technological, fuel, and chemical inputs.
b.It involves the management of pests using a combination of natural and biological controls and minimal or no application of pesticides.
c.It is a scientific discipline that combines biological, physical, and social sciences with ecological theory to develop methods for producing food sustainably.
d.It refers to adjusting soil and crop management to target the precise needs of various areas of a farm.
e.It represents the columns of oxygen-depleted ocean water in which marine life cannot survive and is often caused by algae blooms.