The name most commonly given to the land mass which existed when the continents were joined is a) gonwanda b) afrimerica c) collasus d) pangea

The answer is D. Pangaea :))

a patient chooses to not take a beneficial medical treatment.

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.