Answer:
Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins
Explanation:
<span> nucleotide bases
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Producer primary consumer secondary consumer tertiary consumer decomposer
Answer:
These cells have specific types of receptors on their membranes.