Clearing land is not a sustainable practice in any form, so not A. Crop rotation is important for maintaining soil fertility, but is not necessarily sustainable. It's definitely not C. It is likely D because using only renewable resources is top notch sustainability.
Cell, organism, heart, skeletal muscle, digestive system.
The enzyme is reducing the activation energy needed for the breaking down part to start
A neutron is one of the three subatomic particles, between electrons and protons it has no charge since it is neutral.
