Answer: The mass number is 13
Explanation:
Mass number = Protrons + neutrons;
While Atomic number = Number of neutrons
Therefore, if the atomic number of nitrogen is given as 7, then its Protrons = 7
So, mass number = 7 + 6 = 13
Evolution is the change in heritable characteristics within a species ! :)
Answer:
Seeds become major sinks during the reproductive stages
Explanation:
Answer:
Earth is the third planet from the Sun at a distance of about 93 million miles (150 million km).
<span>In 2005, 27.99 males out of every 100,000 were diagnosed with melanoma.</span>