A strong acid is a number between 0-6 on the pH scale and Bases are between 8-14 on the pH scale the difference is how much hydroxide each one has like coca-cola (acid) and backing soda (base)
I would have to say D because what would a fossil have to do with a neck bone but i might just not be understanding this
The answer is b constant and unique
Las personas más jóvenes tienen más probabilidades de hacer cosas que las personas mayores deberían estar haciendo. El envejecimiento de la poblaciòn podría presionar los presupuestos gubernamentales.