A equilateral triangle?
They don't have right angles, and all sides are the same.
There was two of the same question, but here is the answer again with a little more depth.
D - spine alignment and foot size.
It was only the late Australopiths that had an S-shaped spine. This allowed for them to be bipedal, that is, the ability to walk on two legs as we do. This is because the S-shaped spine allowed them to balance when they were standing. The late Australopiths also have shorter and less flexible toes. These smaller, but sturdier feet made pushing off the ground much easier - aiding in their bipedalism.
insulators do not allow heat flow easily & conductors allow heat to flow easily
Populations that live and interact in the same area.
Answer:
Can result in air pollution, takes a lot of energy to produce, can be seasonable, and competes with food production. Landfill gas, solid waste energy comes from harnessing the decomposition of organic material
