B unsaturated fats like olive oil and pine nuts are the healthy fats
Answer:
A and D i think
Oxygen is ONLY released and others are taken in.
Gas exchange during respiration occurs primarily through diffusion. Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration.
I'm almost positive it is tissue because all organ have tissue but most have muscles, blood, veins
