Question

Определить черты строения, которые отличают млекопитающих от других классов типа Хордовые.​

Answer 1

Ответ:

1. У всех хордовых имеется осевой скелет или хорда . 2. Над осевым скелетом располагается центральная нервная система хордовых, представленная полой трубкой. Почти у всех хордовых передний отдел нервной трубки разрастается и образует головной мозг . 3. Передний (глоточный) отдел пищеварительной трубки сообщается с наружной средой двумя рядами отверстий, получивших название висцеральных щелей.

Объяснение:

Answer 2

Ответ: у млекопитающих имеется ушная раковина, шерстный покров, альвеолярные дифференцированные зубы, диафрагма, альвеолярные лёгкие, 4-хкамерное сердце и левая дуга аорты, полное разделение артериального и венозного коровотоков, в коже имеются различные железы: потовые, стальные и др., внутриутробное развитие зародыша, выкармливание потомства молоком, появляется кора больших полушария переднего мозга.

Объяснение:

Answer 3

Characteristics that Distinguish Mammals from Other Chordates

Mammals are a class of animals within the phylum Chordata. They possess several distinct characteristics that set them apart from other classes within the phylum. Here are some key features that distinguish mammals from other chordates:

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. The ability to nurse their offspring is a unique feature of mammals.

2. Hair or Fur: Mammals have hair or fur covering their bodies. This hair provides insulation, protection, and sensory functions. It helps regulate body temperature and can serve as camouflage or a means of communication.

3. Endothermy (Warm-Bloodedness): Mammals are endothermic, meaning they can regulate their body temperature internally. This allows them to maintain a relatively constant body temperature regardless of the external environment. Endothermy enables mammals to be active and thrive in a wide range of habitats.

4. Specialized Teeth: Mammals have a variety of specialized teeth adapted for different functions, such as cutting, tearing, grinding, and chewing. This dental diversity allows mammals to consume a wide range of food sources, including plants, insects, meat, and more.

5. Diaphragm: Mammals possess a muscular structure called the diaphragm, which separates the thoracic and abdominal cavities. The diaphragm plays a crucial role in respiration by aiding in the expansion and contraction of the lungs during breathing.

6. Efficient Circulatory System: Mammals have a four-chambered heart, which allows for efficient oxygenation of the blood. This enables mammals to have a high metabolic rate and support their active lifestyles.

7. Viviparity: Most mammals give birth to live young, a reproductive strategy known as viviparity. The embryos develop within the mother's body and receive nourishment through the placenta.

8. Complex Brain and Behavior: Mammals generally have well-developed brains and exhibit complex behaviors. They possess advanced cognitive abilities, including learning, problem-solving, and social interactions. This complexity contributes to their adaptability and success in various ecological niches.

These are some of the key characteristics that distinguish mammals from other classes within the phylum Chordata. It is important to note that there is a wide diversity of mammals, and not all species may possess every single characteristic listed above. Nonetheless, these features collectively define the class Mammalia and contribute to the unique biology and ecological roles of mammals in the animal kingdom.