What two statements makes primary and secondary succession similar? 10 points
o
They occur over a long period of time.
The end result is a climax community.
They both can only happen in a forest.

Explanation:

I want to say either a or b because primary is based on the habitat and whatever happens after while secondary is the result to disturbance causing an effect

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

it means there are 3 atoms of oxygen