Question

порівняйте особливості будови та життєдіяльності кишковопорожнинних і кільчастих червів. які ускладнення організації кільчаків ви помітили​

Answer 1

Ответ: Тіло кишковопорожнинних складається з двох добре розвинених шарів — ектодерми (зовнішній) і ентодерми (внутрішній). Між ними міститься тонкий драглистий, майже позбавлений клітин шар — мезоглея (зачаток третього зародкового листка). Товщина мезоглеї може бути незначною (у поліпів) або дуже великою (у медуз).А Тіло кільчаків складається з сегментів

Объяснение:

Answer 2

Comparison of Structure and Life Activities of Flatworms and Roundworms

Flatworms and roundworms are two types of worms that belong to different phyla and exhibit distinct characteristics in terms of their structure and life activities. Let's compare the features of these two groups of worms.

Structure: - Flatworms, also known as Platyhelminthes, have a flattened body shape with bilateral symmetry. They lack a body cavity (coelom) and have a simple digestive system with a single opening that serves as both the mouth and anus. - Roundworms, also called Nematodes, have a cylindrical body shape with bilateral symmetry. They possess a pseudocoelom, which is a fluid-filled body cavity between the gut and body wall. Their digestive system is complete, with a separate mouth and anus.

Reproduction: - Flatworms can reproduce both sexually and asexually. They have the ability to regenerate lost body parts, and some species can even reproduce by fragmentation. - Roundworms also reproduce sexually and asexually. They have separate sexes, with males and females producing eggs and sperm. Some roundworm species can undergo parthenogenesis, a form of asexual reproduction.

Nervous System: - Flatworms have a relatively simple nervous system consisting of a nerve net. They have a centralized ganglia (nerve cluster) that acts as a simple brain. - Roundworms have a more complex nervous system. They possess a nerve ring around the pharynx and longitudinal nerve cords that run along the body.

Habitat and Feeding: - Flatworms can be found in various aquatic environments, including freshwater and marine habitats. They exhibit diverse feeding habits, with some being free-living predators, while others are parasitic. - Roundworms are found in a wide range of habitats, including soil, freshwater, and marine environments. They have diverse feeding habits as well, with some being free-living decomposers, while others are parasites.

Complications in the Organization of Roundworms: - Roundworms can cause various complications in the organisms they infect. For example, parasitic roundworms can cause diseases in humans and animals, such as intestinal infections, lung infections, and even blindness. Some roundworms can migrate to different organs and tissues, leading to severe health issues. - The reproductive capabilities of roundworms can also contribute to their ability to cause complications. Their ability to produce a large number of eggs and their resistance to environmental conditions make them highly adaptable and capable of infecting a wide range of hosts.

In conclusion, flatworms and roundworms differ in terms of their body structure, reproductive strategies, nervous system complexity, and habitat preferences. While flatworms have a flattened body shape and a simple digestive system, roundworms have a cylindrical body shape and a complete digestive system. Both groups exhibit diverse feeding habits, but roundworms are known to cause more complications due to their parasitic nature and reproductive capabilities.