Question

Признаки млекопитающих

Answer 1

1. Выкармливание детёнышей молоком,почти все особи живородящие,обязательно раздельнополые.
2. Имеется мышечная перегородка между грудной и брюшной полостью -- диафрагма.
3. Четырёхкамерное сердце,полная перегородка.
4. Сложный головной мозг,имеющий извилины. 
5. Волосяной покров,железы. Теплокровность.
6. Наличие наружного уха,трёх слуховых косточек,самой ушной раковины.
7. Зубы дифференцированы по выполняемым функциям.
8. 7 позвонков в шейном отделе. 
9. Высокоразвитая нервная система.
10. Лёгкие альвеолярные. 

Answer 2

Characteristics of Mammals

Mammals are a diverse group of animals that share several key characteristics. Here are some of the main features that distinguish mammals from other types of animals:

1. Presence of Mammary Glands: Mammals are named after their defining characteristic, which is the presence of mammary glands. These glands produce milk, which is used to nourish their young.

2. Hair or Fur: Mammals have hair or fur covering their bodies. This hair provides insulation, protection, and can serve various other functions depending on the species.

3. Warm-Bloodedness: Mammals are warm-blooded, meaning they can regulate their body temperature internally. This allows them to maintain a relatively constant body temperature regardless of the external environment.

4. Live Birth: Most mammals give birth to live young, as opposed to laying eggs. However, there are a few exceptions, such as monotremes (e.g., platypus, echidna), which lay eggs.

5. Diaphragm: Mammals have a muscular diaphragm that separates the chest cavity from the abdominal cavity. The diaphragm plays a crucial role in breathing by contracting and expanding the lungs.

6. Specialized Teeth: Mammals have a variety of specialized teeth adapted for different functions, such as cutting, tearing, grinding, or chewing. The specific types of teeth vary among different mammalian species, reflecting their dietary habits.

7. Well-Developed Brains: Mammals generally have well-developed brains compared to other animals. This allows them to exhibit complex behaviors, learn from experiences, and adapt to changing environments.

8. Three Middle Ear Bones: Mammals have three middle ear bones: the malleus, incus, and stapes. These bones transmit sound vibrations from the eardrum to the inner ear, enabling mammals to hear a wide range of frequencies.

These are just a few of the key characteristics that define mammals. It's important to note that there is a wide diversity of mammalian species, each with its own unique adaptations and traits.