Francesco Redi, and Italian physicist disporived the theory of spontaneus generation by observing the relations between maggots and fly eggs on meat.
Though Redi firstly disporived it, the title andn credit was given to the French biologist Louis Pasteur.
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Cellular respiration takes in food and uses it to create ATP , a chemical which the cell uses for energy. Usually, this process uses oxygen, and its called aerobic respiration. It has four stages known as 'Glycolyisis, Link reaction, The Krebs Cycle, and the electron transport chain'
Comets have tails asteroids don't.
Comets are made up of mostly ice.
Asteroids are made up of rock and debris.
There are 4 main functions of roots: absorption of water and inorganic nutrients. anchoring the plant body to the ground and supporting it. storage of food and nutrients. I hope this helps!