Consider statements about evolution: 1. Mutations provide raw material for evolution. 2. Genetic drift occurs in large populations. 3. Speciation can result from geographic isolation. Which are correct? MCQ with Answer and Explanation

Explanation:
Karl Landsteiner discovered the ABO blood group system in 1901, for which he received the Nobel Prize. He also discovered the Rh factor with others.

Explanation:
Acid rain, containing sulfuric and nitric acids, corrodes buildings, monuments (like the Taj Mahal), and statues made of limestone and marble. The depletion of the stratospheric ozone layer reduces its ability to absorb harmful ultraviolet (UV-B) radiation, increasing the amount reaching the Earth's surface. Global warming is caused by an increase, not a decrease, in atmospheric greenhouse gases (like CO2 and methane), which trap more heat. Thus, statements 1 and 2 are correct.

Explanation:
Capillaries are the smallest blood vessels, with walls only one cell thick (endothelium), facilitating diffusion of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues. Arteries and veins have thicker walls with smooth muscle and connective tissue. Capillaries form extensive networks (capillary beds) throughout the body.