The kingdom Protists contains the most diverse species of organisms, which are A. only found in dry environments.

B. all single-celled, advanced organisms.

C. similar to the other kingdoms because they can be plantlike, funguslike, or animal-like.

D. similar to organisms in the kingdom Bacteria because they lack membrane-bound organelles.

d. changes in climate and historical records

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answer denitrification;

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).

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