Pretty sure it’s D because when cold and warm air mix a tornado forms not sure tho
<span>Once a month an egg is released from one of the almond shaped organs known as the ovary.</span>
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).
The number of protons,neutrons,electrons, the way the are classified (earth metal, noble gas,meteoroids) and also the way they react.
