Assertion (A): The process of breathing is also called pulmonary ventilation. Reason (R): It involves the movement of air into and out of the lungs. MCQ with Answer and Explanation

Explanation:
The lymphatic system includes lymph, lymphatic capillaries, vessels, ducts, and lymphoid organs (nodes, spleen, thymus). It returns tissue fluid to the blood, absorbs fats, and defends against pathogens.

Explanation:
While restriction enzymes were first observed by Linn and Arber, the first Type II restriction endonuclease (HindII), which is the type used in genetic engineering because it cuts at specific recognition sites, was isolated and characterized by Hamilton O. Smith, Kent W. Wilcox, and Thomas J. Kelly in 1970 from Haemophilus influenzae. For this discovery, Smith shared the Nobel Prize in Physiology or Medicine in 1978. Kary Mullis invented PCR.

Explanation:
Genetic drift is a random change in allele frequency, more pronounced in small populations, and can reduce genetic diversity. Natural selection leads to adaptation.