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Due to oxidation of respiratory substances inside
Apples turning brown after peeling the skin off, and bananas peels turning brown after peeling them. Rusting iron.
That the lime was going to help the apple from turning brown.
Flower petals turn brown due to natural aging, damage to the petals or because of funghi. Regarding natural aging and damage to the petals the browning is simply the decomposition of the plant.
An apple turning brown is both a chemical and a physical change. Physically it changes appearance by turning brown. Chemically it oxidizes when the air comes in contact with the enzymes and chemicals in the fruit.
Minerals
yes
if it its leafs are turning brown then that probably means that it is sick or is not getting enough light.
your not watering it?
Charlie Brown
brown
if it is the hair that is turning brown then yes, if it is the skin then no. go see a vet