Human
Cells >> Tissues>> Organs >> __________ >> Organism.
What is missing from this order?
Organ Systems
A metal that is a mixture of two or more elements.
Alloy.
A hot dusty wind that blows from the Sahara desert.
Khamsin.
What is the ultimate energy source of most of the energy we use?
Sun.
Rapid to and fro movements.
Vibrations.
In the body, which part works as a pump?
heart.
A group of two or more atoms linked together by chemical bonds.
Molecule.
The era of the dinosaurs. The Jurassic period is part of this era.
Mesozoic.
A sound that has been reflected from a surface.
Echo.
Type of material that allows light to go through.
Transparent.
Which cells are packed with haemoglobin?
Blood cells.
A substance that changes color to show how acid or alkaline a solution is.
Indicator.
A gas in the upper atmosphere that protects us from harmful rays from the sun.
Ozone.
An increase in the amount of which gas in the air is responsible for global warming?
Carbon dioxide.
The type of the lens that inverts the image.
Convex / Converging lens.
The process of heating milk to kill germs.
Pasteurization.
Metals are good _________, because they allow heat and electricity to go through.
Conductors.
Which weather instrument would you use to measure the air pressure?
Barometer.
Empty space that contains no matter, not even air.
Vacuum.
Name few products of factional distillation of the crude petroleum.
Gases / oils / petrol / bitumen / kerosene / naphthalene / diesel.
Substance taken to fight disease, relieve pain, alter feelings or affect the body in some other way.
Drugs.
Insulators.
What caused the hole in the ozone layer?
CFCs.
Repeated up and down or to and fro movements that travel away from a wave source and carry energy from place to place.
Wave.
A unit for measuring the loudness of sounds.
Decibel.