Single gang where are you?

Iam stuck on this question! 45 points : ) how do increases in temperature affect the density of ocean water? answer choices: (a) density does not change (b) density increases (c) density becomes variable (d) density decreases

How did the europeans design the national borders of africa? why?

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!