Question

Living organisms all contain fats that are called .... protiens, lipids, carbohydrates, and ____
a.oxygenb.heliumc.copperd.potassium

Answer 1

The last one is Nucliec Acids. I have no idea why it doesn't state that.
I would try looking up the different types of nucliec acids. Maybe you could find an awnser that way.

Answer 2

The answer would be D potassium