C. Survive long periods of dormacy
A token economy.
It basically means that rewards and punishment shape behavior of students.
The plants on earth need sunshine to do photosynthesis
Second, if the earth doesn't recieve sunshine for a long time, it will freeze
Cells get nutrients from their environment, but where do those nutrients come from? Virtually all organic material on Earth has been produced by cells that convert energy from the Sun into energy-containing macromolecules. This process, called photosynthesis, is essential to the global carbon cycle and organisms that conduct photosynthesis represent the lowest level in most food chains (Figure 1).