The hotter the farther apart water molecules become, creating steam
the colder makes the molecules become more dense making ice.
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Plants release oxygen through the process of photosynthesis which helps the animals for respiration. They also maintain the balance of oxygen and carbon dioxide in the atmosphere. That is why the forests are called green lungs.
I’m not 100% sure but i think it’s: spores produced in basidia, important in the food industry, important in the fermentation process and can cause disease to plants