The word you're looking for is "redundant." It refers to something that is no longer necessary or useful, often because it is more than what is required. In various contexts, it can describe information, roles, or materials that are excessive and can be eliminated without loss.
The root word of the word discarded is discard.
The word that means ready when needed is "prepared."
another word for NEEDED starting with a D is dependable.
Required.
Twice is a word that means two.
The word that means a species of animals or plants is not longer in existence is extinct. Animals that are no longer plentiful, might be called endangered.
I know ones which are :tormentoso, turbulenta and turbulento.
French - decamper English - decamp, depart.
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It means 'no longer here'.
The word "violent" is pretty mean.
Omnibus