Answer:
A cell membrame is the semipermeable membrane surrounding the cytoplasm of a cell. Cell membranes are made up of phospholipids and proteins. Phospholipids form the basic structure of a cell membrane, called the lipid bilayer.
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Answer:
Mitochondral
Explanation:
Mitochondria were made before ribosomes
Answer:
1) metals; left
2)sodium: alkali metals calcium: alkaline earth
Explanation: