Since it has 4 protons, it must have an atomic number of 4. (That makes it beryllium.)
Since it has a 4 protons and 5 neutrons, it has a mass number of 9.
You never put the answer choices so I can’t answer this question
AARP. Which legitimately American Association of Retired Persons
. Which honestly speaks for itself. This groups has stood for 10 years and helps many today.
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA.
Answer:
D)
Explanation:
Because the independent variable stays the same for all the people in the experiment
