Answer:
Your answer would be D.
They are defined by their different physical features.
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Atoms are electrically neutral because they have equal numbers of protons positively charged and electrons negatively charged.
The largest vein in an animal's body is in fact the Vena Cava.
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Explanation:
The middle ear is an air-filled cavity that sits between the tympanic membrane and the inner ear. The middle ear also consists of three tiny bones called ossicles , the round window, the oval window , and the Eustachian tube .
Genomes are the large structures of DNA containing many genes i believe
