"Slash-and-burn" was a method that early humans used for what purpose? A)
agriculture
B)
metallurgy
transportation
D)
writing

Answer is A, agriculture.

Explanation:

It is a method that involves cutting and burning plants in a forest to create a field called a swidden.

they use tree rings to figure out weather patters.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.