Answer:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Explanation:
This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
Answer:
because of different antigen
The answer is aldosterone. It is produced by the adrenal gland and is significant in the homoestatic balance of electrolytes in the body. It acts on the mineralocorticoid receptors in the distal tubules and collecting ducts of the nephron, therefore influencing the reabsorption of sodium and excretion of potassium by the kidneys.