Identify from the following list which examples are controlled experiments. You make two pitchers of lemonade and -only change the amount of lemonade mix you add.
-only change the amount of water you add.
-change both the amount of water and the amount of lemonade.

The answer is A&B

if you listed your answers right then i believe your answer is b.

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).