Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
A species of mollusc widespread in freshwaters.
During the evolution of vertebrates the relative development of brain areas has changed.
Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.
One of the largest marsupials.
The fat-tailed scorpion is one of the world's most dangerous scorpions.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
Long-necked herbivorous dinosaur with a robust body.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
Several analogous types of eyes have developed independently through convergent evolution.
Moles are small subterranean mammals with modified, spade-like forelegs.
Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.
The anatomy of annelids is demonstrated through the example of the common earthworm.
Honeybees produce a sweet and nutritious substance, honey.
The most ancient group of animals, they live underwater, lack real tissues and body symmetry.
Widespread heterotrophic unicellular organisms with constantly changing shapes
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
The dentition of different species of mammals reflect their feeding habits.
The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.