Cell
The smallest living organism that is made of just once cell.
Unicellular
The mouth, teeth, stomach and intestines work together as parts of this system.
Digestive.
A group of two or more atoms held together by bonds.
Molecule.
According to the radioactive dating how old is the Earth?
4600 million years, 4.6 billion years.
Name examples of fossil fuels.
Gas, Coal, Oil.
it is mainly water but it is where a cell's chemical reactions happen.
Cytoplasm
How many bones are in the human's skeleton system?
206
When atoms of different elements link together to form a molecule we call this ...
Compound.
In which eon did the life first appear in a form of microscopic organisms?
Archean eon.
Carbon dioxide and other harmful gases are like a blanket around the Earth. They trap the sun's heat. This makes the atmosphere heat up. This is called the .....
Greenhouse effect.
Cell wall is made of this.
Cellulose
It is made of strong fibers and attaches the bones together.
Tendons.
What is the name of this molecule: CO2 ?
carbon dioxide.
What is a depression?
A region of low pressure / reduction of the pressure.
Name examples of renewable energy sources.
Solar energy, wind energy, wave energy, biofuel.
Vacuole
Name the main parts of central nervous system.
Brain and spinal cord.
A base is a substance that reduces the strength of an acid when it reacts with it. If the base will dissolve in water we call it an .....
Alkali.
Which device is used to record the wind speed?
State the law of reflection.
What is a tissue?
A group of cells of the same kind.
What jobs does the circulatory system do?
carry oxygen and nutrients around the body.
A compound made when an acid reacts with a metal or a base.
Salt.
In which climate zone is Georgia located?
Temperate/Continental.
When light travels at an angle from one substance into another, it changes direction. This direction change is called ......
Refraction.