L-cysteine and L-valine
Penicillin is a secondary metabolite commonly found in the filamentous
fungi and they are synthesized from the amino acid precursors L-cysteine, L-valine and l-α-aminoadipic
acid. β-lactam antibiotic penicillin are antibiotics commonly used for the
treatment or therapy of infectious diseases.
Both nuclear and chemical equations are balanced according to the total mass before and after the change.
In every equation or reaction, the total mass of the reactants must be equal to the total mass of the products. In other words, all reactions - be they chemical or nuclear - must obey the law of conservation of mass.
The law of conservation of mass states that mass can neither be created nor destroyed, but can be converted from one form to another during a reaction.
Thus, in order to balance reactions involving chemical or nuclear reactants, the total mass before the reaction must be equal to the total mass after the reaction.
More on the law of conservation of mass can be found here: brainly.com/question/13383562
Radon is a radioactive noble gas. It is really difficult to find it naturally since it does occur, but in really small quatities as it is a radioactive element, and therefore dacys.
Symbol: Rn
Atomic number: 86
Hope it helped,
BioTeacher101
I think the answer is:
D.) endangered species extinction.
Hope this helps :)