Answer:
Explanation:
The things that are changing in an experiment are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled
I am going to assume you meant the "first trophic level" of the ecosystem. The first tropic level of an ecosystem is made up of producers, so the answer is C, Acorns.
Demand is the amount of a product customers are prepared to buy at different prices. Supply is the amount of a product businesses are prepared to sell at different prices. There are many different types of market. The goods market is where everyday products such as DVDs are traded.
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