Answer:
 cytoplasm is also present in a bacteria amoeba and epithelium. These are a few structures that are common components of bacteria amoeba and epithelial cells. 
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Answer:
Chloroplast is specific to plant cell because plants are the autotrophs which can prepare their food by conversion of light energy to chemical energy. It is the vital photosynthetic pigment in leaves as it involves the conversion of light energy into chemical energy.
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A. an open circulatory system 
Explanation: In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel