<span>Ferns and reptiles appeared in the paleozoic era.</span>
cities have factories , more people and no water around .
The answer would be B fossil fuel is used it cars so increasing human population therefore would increase the burning of fossil fuels
Answer:
(Ar) 4s2
Explanation:
How many numbers in tje outershell etc calcium atomivc no20
A indicator is a weak organic acid or a base which has shows different colors in acidic and basic mediums. The color change occurs when the weak acidic or basic indicator dissociates to give its respective conjugate base or conjugate acid.
Therefore the correct option would be Indicators are weak acids or bases.
