Answer:
Together,the number of protons and the number of neutrons determine an elements isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.
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The vas deferens are a fibromuscular tube which connect to the epididymis, and is an excretory duct of the testis.
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Answer:
the scientific study of the physiology, structure, ecology, classification, and economic importance of plants.
Answer:
The Earth is 4.6 Billion years old.
QUESTION 2:
Option A is the correct answer.
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