Power is measure in watts which is joules per second
Producers are called producers because when they take in carbon dioxide and water, and they produce glucose and oxygen. Animals need oxygen to survive and producers are the reason that all of the animals on earth haven't used up all the oxygen in the atmosphere. We need producers to survive, otherwise the Earth would be carbon dioxide rich and we humans couldn't breath it.
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That doesn't mean the energy is gone, it's just not where you are looking. The universe is defined as all energy and matter. It is everything. Closed system there is ...
A mutation is one form of genetic variation.
