Normal blood pressure is considered to be at or below 120 over 80 (120/80).

Correct Option: A

Normal blood pressure is considered to be at or below 120 over 80 (120/80).

Each cell in the body contains 23 pairs of chromosomes. One chromosome from each pair is inherited from mother and one is inherited from father. The chromosomes contain the genes we inherit from our parents. There may be different forms of the same gene called alleles.

Correct Option: C

Each cell in the body contains 23 pairs of chromosomes. One chromosome from each pair is inherited from mother and one is inherited from father. The chromosomes contain the genes we inherit from our parents. There may be different forms of the same gene called alleles.

Red Blood Cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells. They are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O₂) to the body tissues via the blood flow through the circulatory system.

Correct Option: C

Red Blood Cells develop in the bone marrow and circulate for about 100–120 days in the body before their components are recycled by macrophages. Each circulation takes about 20 seconds. Approximately a quarter of the cells in the human body are red blood cells. They are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O₂) to the body tissues via the blood flow through the circulatory system.

Femur is the strongest bone of the body which is bone of the leg situated between the pelvis and knee in humans. It is the longest, heaviest and the strongest bone. It is the only bone in the thigh.

Correct Option: A

Femur is the strongest bone of the body which is bone of the leg situated between the pelvis and knee in humans. It is the longest, heaviest and the strongest bone. It is the only bone in the thigh.

If a person belongs to the blood group AB, he has both A and B antigens on the surface of his red blood cells and no A or B antibodies at all in his blood plasma. So he can donate blood to those having AB blood group; but can receive blood from AB, A, B, and O groups.

Correct Option: D

If a person belongs to the blood group AB, he has both A and B antigens on the surface of his red blood cells and no A or B antibodies at all in his blood plasma. So he can donate blood to those having AB blood group; but can receive blood from AB, A, B, and O groups.