O Zorg is living/lives on a different planet.
1 The girls are visiting/visited their uncle now.
2 Scott stays/stayed in a nice hotel yesterday.
3 He is packing/packs his bag tomorrow.
4 Laura always swam/swims when she goes
on holiday.
5 The family explored/are exploring the city
last night.
The body is not different FROM any other machine.
A motorcar engine,for example, needs fuel IN the form of petrol.
It is burnt INSIDE the engine to produce the energy which drives the car.
But petrol,gas,coal,wood or any other form OF fuel can only burn IN the presence of oxygen. Thus, all machines and body cells are alike BY requiring oxygen to burn their fuel and thereby producte the energy needed to perform their functions.
Fuel or nutrients and oxygen are carried IN the blood to all parts of the body.