How many pairs of homologous chromosomes are found in human body cells

Answer:

A) Motor neurons and sensory neurons

Explanation:

We can answer the question by answering the following questions

What is the nervous system?

• Nervous system is a s system in the body that helps in the coordination between all the body parts and the brain which is the control center.

How is the nervous system classified?

• The nervous system is classified into central nervous system and peripheral nervous system.

What comprises of the central nervous system?

• The central nervous system is made up the brain and the spinal cord.

What comprises of the peripheral nervous system?

• The peripheral nervous system is comprised of all the parts of the nervous system outside the brain and the spinal cord.
• It includes the sensory neurons and the motor neurons.
• Motor neurons transmits impulses from the brain to the effector cells such as muscles and glands.
• Sensory neurons, on the other hand, transmit nerve impulses from the sensory organs to the central nervous system.

Answer:

B

Explanation:

Atoms are those particles which cannot be broken down further. But, later on the subatomic particles were discovered

Final answer:

John Dalton's Atomic Theory states that atoms are indivisible and cannot be broken down further. They combine to form molecules and are not all composed of carbon. Atoms do have mass.

Explanation:

John Dalton, an English chemist, is famous for his theory of atomic structure, also known as Dalton's Atomic Theory. According to this theory, atoms are the tiniest particles of matter which cannot be divided or broken down further into simpler substances by chemical means. Thus, the correct answer to the question would be (b) - atoms cannot be broken down further.

Atoms can combine in various proportions to form molecules, but they themselves do not contain molecules. Also, not all atoms are composed of carbon, there are many other elements such as hydrogen, oxygen, nitrogen, to name a few. Finally, atoms do possess mass, it is one of their fundamental properties.

Learn more about Dalton's Atomic Theory here:

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Answer:

• An ionic bond is an attraction between oppositely charged ions. A covalent bond is a sharing of electrons between atoms.

Explanation:

• The difference between an ionic and a covalent bond is that a covalent bond is formed when two atoms share electrons. Ionic bonds are forces that hold together electrostatic forces of attraction between oppositely charged ions.