Question

Завдання 8. Оберіть із шести запропонованих і позначте три ознаки, які характе- ризують опорно-рухову систему птахів. ord 1) більшість кісток черепа сполучаються за допомогою швів 2) частина кісток має порожнини, заповнені повітрям 3) скелет складається зі скелета голови, тулуба та кінцівок 4) на передніх кінцівках п'ять пальців 5) передня частина хребта нерухомо з'єднана з черепом 6) до кiля прикріплюються м'язи, які забезпечують рухи крил під час польоту ​

Answer 1

Відповідь: 2, 3 і 6

Пояснення:

Answer 2

Characteristics of the Skeletal System in Birds

Birds have a unique skeletal system that is adapted for their ability to fly. Here are three characteristics that distinguish the skeletal system of birds:

1. Pneumatic Bones: One characteristic of the avian skeletal system is the presence of pneumatic bones. These are bones that have air-filled cavities, which are connected to the respiratory system. The air sacs in birds extend into the bones, making them lightweight and aiding in flight. This adaptation allows birds to have a lighter body weight, making it easier for them to fly [[1]].

2. Fused Bones: Another characteristic of the avian skeletal system is the fusion of certain bones. In birds, many of the bones in the skull are fused together, forming a rigid structure. This fusion provides stability and strength to the skull, which is important for withstanding the forces generated during flight [[2]].

3. Modified Forelimbs: Birds have modified forelimbs that are adapted into wings for flight. The bones in the wings are elongated and modified to support the flight feathers. The hand bones are fused together to form a rigid structure, while the fingers are reduced in number. Birds typically have three fingers, with the first finger being reduced or absent. These modifications allow for the attachment of flight muscles and the manipulation of feathers during flight [[3]].

These three characteristics, pneumatic bones, fused bones in the skull, and modified forelimbs, are key features of the avian skeletal system that enable birds to fly efficiently.

I hope this helps! Let me know if you have any further questions.

[[1]] Source: [Britannica - Bird - Skeletal system](https://www.britannica.com/animal/bird/Skeletal-system) [[2]] Source: [ThoughtCo - Bird Anatomy: The Skeleton](https://www.thoughtco.com/bird-anatomy-the-skeleton-3854240) [[3]] Source: [National Geographic - Bird Anatomy](https://www.nationalgeographic.org/media/bird-anatomy/)