Answer: <span>Marbles placed inside a hollow sphere are used to describe protons in a nucleus.
Models are artificial representations used to show some phenomena or features of the real world.
In this case, it has been used a sphere and marbles, to represent the fact that nuclei of atoms contain inside some smaller partilces which are the protons.</span>
Answer:
identical twins dna is one dna split into 2 dnas peices which is why they are identical non e of this is true for any other kids by the same parents who are not twins.
Explanation:
Answer:
The first stage of aerobic respiration is glycolysis in which glucose molecule is broken down into two molecules of pyruvic acid. Thus, pyruvic acid is the intermediate product of aerobic respiration. The end products of anaerobic respiration are Lactic acid or ethanol and ATP molecules