Flowering plants: flower, double fertilization, fruit.
Reptiles: internal fertilization emergence of germinal membranes, keratinization of the skin, incomplete septum in the heart.
Vertebrates: the appearance of the spine.
Mammals: four-chambered heart, loss of the right aortic arch, warm-bloodedness, feeding the young with milk, diaphragm, hair.
Insects: trachea, a variety of oral apparatus, chitinous cover, articulated limbs, wings.
Birds: four-chambered heart, warm-bloodedness, care for posterity.
Amphibians: five-fingered limbs; lungs; 3-chamber heart and two circles of blood circulation; middle ear
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.