Who first introduced the idea that the sun is the center of the universe?

your answer is true

i am 100% sure

explanation:

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added

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).