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A lesson about walnut trees and walnut fruits.
A lesson about the anatomy and development of onions.
Dogs are our loyal companions. Learn about their anatomy and behaviour.
Houseflies are among the best-known animals, they can be found in every region inhabited by humans.
Let's compare the two well-known bird species.
A lesson about the most important characteristics of the common earthworm.
This lesson introduces the anatomy and lifestyle of fishes through the examples of the common carp and the European catfish.
A lesson about the most common species of shorebirds.
Arthropods can be found on shores, on the surface of waterbodies and underwater.
Numerous insects live on tree trunks, in the foliage and on the ground. Let's learn about some species.
In the body, substances are continiuously absorbed and released.
Let's learn about the various types of worms by looking at the characteristics of typical species.
Let's follow the path of water in plants from the roots to the leaves
“Health” and “illness” refer to two opposite states of the body.
There are plenty of weeds and herbs on fields, agricultural areas and even in carefully tended gardens.