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Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.
The animation demonstrates the most important types of feathers and their fine structure.
Geckos can walk on walls or even ceilings. The 3D scene explains this ability.
Larvae of this type of mayflies spend the first three years of their lives in water, their adult lives last for only one day which they use for mating.
The hypothalamic-pituitary axis is the regulating centre of our endocrine system.
An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.
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.
The limbic system plays an important role in forming emotions and in learning.
With the example of the stag beetle we demonstrate how insects' muscles function, how insects fly and how they reproduce.
The cause of a heart attack is the blockage of a coronary artery. It is one the most common causes of death.
While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.
The European badger is an omnivorous, nocturnal animal. Badger colonies live in large burrow systems, called setts.
Tardigrades can survive in extreme environments, they can even stay alive in outer space.
The Northern white-breasted hedgehog rolls into a ball to protect itself.
This animation demonstrates how muscles and vertebrae move the head.
This animation presents levels of biological organisation from the level of the individual organism to the level of cells.
Adrenaline, also known as epinephrine, is a hormone produced in our body in stressful situations and plays an important role in the fight-or-flight response.
Scoliosis is a medical condition in which a person's spine has a lateral deviation.
The fat-tailed scorpion is one of the world's most dangerous scorpions.