The two groups of angiosperms are monocots and dicots.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
This animation demonstrates geometric rotation, a type of geometric transformation both in plane and space.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
This animation demonstrates geometric translation in both plane and space.
This animation demonstrates geometric reflection, a type of geometric transformation both in plane and space.
The animation helps to develop space perception.
The animations demonstrates the structure of a typical flower.
Matter is made up by quarks and leptons, while interactions are carried by bosons.
The excellent road and aqueduct system covering the whole empire reflects well the development of the Roman civilisation.
We can travel on dual carriageways on the motorway.
Human blood consists of blood cells and plasma.
This animation demonstrates the structure of nitrogen molecules, with one sigma and two pi bonds holding the atoms together.
This animation demonstrates the development of the human embryo and foetus.
Legendary geographical discoveries at the beginning of the Modern Age had not only redrawn maps, but also had a truly diverse impact.
The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.
Mitosis is the process by which a eukaryotic cell divides into two cells and the number of chromosomes remains unchanged.
Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.
Our body´s internal support structure to which skeletal muscles are attached.
A series of fortifications built to prevent incursions from northern nomadic groups.