The layer of the Earth's atmosphere that contains the protective ozone layer is the: MCQ with Answer and Explanation

Explanation:
The right ventricle pumps deoxygenated blood through the pulmonary artery to the lungs for oxygenation. The pulmonary artery is the only artery carrying deoxygenated blood. Pulmonary veins carry oxygenated blood from lungs to the left atrium. The left atrium receives oxygenated blood, not deoxygenated. The right atrium receives deoxygenated blood from the body. Thus, C is correct.

Explanation:
The liver synthesizes most plasma proteins, including albumin (osmotic pressure) and clotting factors (I, II, VII, IX, X). The kidneys produce erythropoietin and active vitamin D, pancreas digestive enzymes, spleen filters.

Explanation:
Phagocytosis ('cell eating') is the process by which cells like macrophages and neutrophils engulf solid particles, including pathogens, by extending pseudopodia to form a phagosome, which fuses with lysosomes for degradation. Pinocytosis is 'cell drinking', uptake of fluid. Exocytosis is secretion. Dialysis is artificial separation. Phagocytosis is a key innate immune defense.