This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
Ports must provide necessary infrastructure and services for industry and marine transportation.
The anatomy of annelids is demonstrated through the example of the common earthworm.
A species of mollusk widespread in freshwaters.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
Widespread heterotrophic unicellular organisms with constantly changing shapes
The reproductive system consists of organs which work together for the purpose of reproduction.
The capacity of data storage devices have increased at an incredible rate during the past decades.
Water turbines convert the kinetic energy of water into electric current.
A hot air balloon is a balloon aircraft which is lifted by hot air.
Domesticated animals and crops originate from various parts of the world.
In summer, monsoon winds bring heavy rainfall from the ocean to the continent.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
The reproductive system is a series of organs working together for the purpose of reproduction.
Regular dice can be used for solving statistical and probability exercises.
Division of space by three intersecting planes in several different arrangements.
The United States entered World War II after the devastating attack by the Japanese army.
To calculate the volume of a tetrahedron we start by calculating the volume of a prism.
The knee joint is made up by the femur, the tibia and the kneecap.