Which of the following diseases is caused by a protozoan? MCQ with Answer and Explanation

Explanation:
Mature mammalian red blood cells (erythrocytes) lose their nucleus and other organelles during development to maximize space for hemoglobin. Thus they are anucleate. They cannot divide or repair themselves and have a lifespan of about 120 days. Neurons, leukocytes, and hepatocytes are nucleated. RBCs obtain energy through anaerobic glycolysis.

Explanation:
The femur (thigh bone) is the longest, strongest, and heaviest bone, supporting body weight during standing and walking.

Explanation:
Jonas Salk developed the inactivated polio vaccine (IPV) in 1955, which was the first effective vaccine. Albert Sabin later developed the oral polio vaccine (OPV). Pasteur rabies, Jenner smallpox.