Answer:
The Quantum Model of the Atom 1927
Explanation:
It is the most accurate model of the atom but I don't know about the easiest to visualise. Soz :(
Answer:
They were not around at that time or either from it being so hot they just disappeared/melted.
Explanation:
Answer:
E
F
A
B
C
D
matched according to your questions.
B causes all vegetation to freeze
