Why we respire all the time?

Why doensn't the stone move up all the time? Why does it fall down after reaching a certain height?

Sudden increase in ethylene production & increase in the rate of respiration at the time of ripening called as

i. Will the velocity of a stone thrown vertically upwards remian constant or will it change with time? How will it change? ii. Why doesn't the stone move up all the time? Why does it fall down after reaching a certain height? iii. What does its maximum height depend on?

What is respiration?

Why is respiration in insect called direct respiration?

Fish and frog can respire in water. Can they respire through their skin. If yes, why do they have gills?

Fish and frog can respire in water. Can they respire through their skin? If yes, why do they have gills?

Why is the final step of aerobic respiration called terminal oxidation?