<h3>
NEUTRONS AND PROTONS</h3>
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks. The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus.
True
There is not doubt about Charles Darwin merits as one of the most important scientifics. His wide research of the living organisms and biodiversity lead him to formulate the natural selection and evolution theories.
Answer:
1.) Why does menstruation begin?
A.) Period happens because of changes in hormones in the body.
2.) How long does the menstrual cycle usually last?
A.) the menstrual cycle lasts 21 to 35 days while bleeding between 2 to 7 days
<u>-TheUnknownScientist</u>
I think you are right. B is the right answer.
They are both similar because they both replicate stuff and they are different because DNA replication is natural but DNA cloning is man-made.
hope it helps!
