Question

Плоские черви характеристики​

Answer 1

Ответ:

Трехслойные многоклеточные животные

Двухсторонняя симметрия тела

Несегментированный

Ацеломические (паренхимные)

Центральная нервная система на переднем конце; очень простая нервная сетка; ганглии

Органы чувств: светочувствительные глазки, органы равновесия (статоцисты), обоняния, осязания (сенсилы — неподвижные реснички, к которым подходят нервные окончания) — развиты преимущественно у свободно живущих видов.

Выделительная система образована разветвленными трубочками, оканчивающимися пламенными клетками (протонефридии)

Уплощены в дорсовентральном направлении.

Answer 2

Characteristics of Flatworms

Flatworms, also known as Platyhelminthes, are a group of invertebrate animals that are characterized by their flat, elongated bodies. They belong to the phylum Platyhelminthes, which includes various species of worms. Here are some key characteristics of flatworms:

1. Body Structure: Flatworms have a flattened body shape, which gives them their name. Their bodies are dorsoventrally flattened, meaning they are flattened from top to bottom. This allows them to live in various habitats, including freshwater, marine environments, and even inside other organisms.

2. Symmetry: Flatworms exhibit bilateral symmetry, meaning their bodies can be divided into two equal halves along a central axis. This symmetry allows for efficient movement and coordination.

3. Digestive System: Flatworms have a simple digestive system with a single opening called the mouth. This opening serves as both the entrance for food and the exit for waste.

4. Nervous System: Flatworms have a centralized nervous system, with a simple brain and nerve cords that extend throughout their bodies. This allows them to respond to external stimuli and exhibit basic behaviors.

5. Reproduction: Flatworms can reproduce both sexually and asexually. Some species are hermaphroditic, meaning they have both male and female reproductive organs and can produce offspring on their own. Others require mating between individuals to reproduce.

6. Respiration: Flatworms do not have specialized respiratory organs. Instead, they rely on simple diffusion to exchange gases with their environment.

7. Habitats: Flatworms can be found in a wide range of habitats, including freshwater, marine environments, and damp terrestrial environments. Some species are parasitic and live inside the bodies of other organisms, while others are free-living.

8. Diversity: Flatworms are a diverse group, with over 20,000 known species. They can vary in size, ranging from microscopic to several meters in length. Some well-known examples of flatworms include planarians, tapeworms, and flukes.

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