Answer:
B.
Explanation:
Gravity. It helps keep all the planets in play.
Answer:
it allows scientists to quickly make many copies of DNA.
Explanation:
When a person breathes the oxygen enters the bronchioles in the lungs. From there, the oxygen enters the alveloi. The gas exchange occurs in the capillaries surrounding the alveloi. The oxygen enters the blood in these capillaries. These capillaries then join together to form arteries, which transport the oxygen. The pulmonary veins then transport this oxygen rich blood to the heart. The left atrium pumps this blood to the left ventricle, from where it enters the aorta, which transfers the blood to the kidneys through a network of blood vessels.
Hence, the correct sequence of the events will be : B A E C D F
Answer: Option (4) is the correct answer.
Explanation:
An atom consists of three types of sub-atomic particles which are electrons, protons, and neutrons.
Protons have a positive charge and neutrons have no charge. Whereas electrons have a negative charge.
Protons and neutrons are placed inside the nucleus of an atom. On the other hand, electrons revolve around the nucleus of the atom.
Thus, we can conclude that the structure of an atom is best described as electrons in orbit about a nucleus of protons and neutrons.