Why roundworms are cylindrical in shape and earthworms are cylindrical

First of all, let me talk about the difference between a cylinder and a cylinder: a cylinder is solid and a cylinder is hollow. The roundworm is slender like a thread, the surface is smooth and there is nothing else protruding, and because the body is solid, it can be called a cylinder.

Summary. Ascaris has a well-developed digestive tract, the body surface is covered by a keratinum, and the excretory system belongs to the protorenal duct system, which is dioecious, more complex and higher than that of animals without body cavities. The body of the annelidan ringworm is composed of many similar body segments, has a true body cavity, and has verrucous feet and bristles, and is agile in movement.

The segmentation phenomenon and the appearance of true body cavities make various organ systems more complex and functional. Annelids were the beginning of higher invertebrates in animal evolution.

Hello, roundworms are reed-shaped animals, and earthworms are annelids. Different lifestyles: roundworm camp parasitic life; Earthworms are self-reliant.

Different from human relations: roundworms parasitize the human body, ingest nutrients, cause diseases, and are harmful to humans; Earthworms are fertile.

Ascaris has a well-developed digestive tract, the body surface is covered by a code plasma membrane, and the excretory system belongs to the protorenal duct system, which is dioecious, more complex and higher than that of animals without body cavities. The body of the annelidan ringworm is composed of many similar body segments, has a true body cavity, and has verrucous feet and bristles, and is agile in movement. The occurrence of segmentation and the appearance of true body cavity observation makes various organ systems more complex and functional.

At a higher stage in animal evolution, annelids are the beginning of higher invertebrates.

Summary. Relatives, roundworms, and ringworms are both invertebrates, but they belong to different taxa with different morphological and biological characteristics. Ascaris belongs to the phylum Nematodes, Ascaris.

Ascaris are elongated, cylindrical, and have no distinct rhythmic characteristics, and have longitudinal muscles on the body surface that are able to twitch their bodies to move. Ascaris can live in the intestines of humans and other mammals and can absorb nutrients from the host, leading to health problems such as malnutrition. Ringworms belong to the phylum Annelids, the class Ringworms.

The ringworm is long and slender in size and consists of many separate links, each with many tiny rings on it, which are used for movement and predation. The body wall of the ringworm from the outside to the inside is: **, muscle layer, nerve layer, and coelenteric layer, and unlike roundworms, the ringworm has obvious rhythmic properties.

In summary, roundworms and ringworms are significantly different in terms of morphology, taxonomy, biological characteristics, etc.

Relatives, roundworms, and ringworms are both invertebrates, but they belong to different taxa with different morphological and biological characteristics. Ascaris belongs to the phylum Nematodes, Ascaris. Ascaris are elongated, cylindrical, and have no distinct rhythmic characteristics, and have longitudinal muscles on the body surface that are able to twitch their bodies to move.

Ascaris can live in the intestines of rubber-shirted humans and other mammals, and can absorb nutrients from the host, leading to health problems such as malnutrition. Ringworms belong to the phylum Annelids, the class Ringworms. The ringworm is long and slender in size and consists of many separate links, each with many tiny rings on it, which are used for movement and predation.

The body wall of the ringworm is divided into the following from the outside to the inside: **, muscle layer, nerve layer, and coelenteric layer, which is different from roundworms, and has obvious rhythmic properties. As mentioned above, roundworms and ringworms are significantly different in terms of morphology, classification, and biological characteristics.

Fellow, I really didn't understand, I can be more specific.

Relatives, roundworms, and ringworms are both invertebrates, but they belong to different taxa with different morphological and biological characteristics. Ascaris belongs to the phylum Nematodes, Ascaris. Ascaris are elongated, cylindrical, and have no distinct rhythmic characteristics, and have longitudinal muscles on the body surface that are able to twitch their bodies to move.

Ascaris can live in the intestines of rubber-shirted humans and other mammals, and can absorb nutrients from the host, leading to health problems such as malnutrition. Ringworms belong to the phylum Annelids, the class Ringworms. The ringworm is long and slender in size and consists of many separate links, each with many tiny rings on it, which are used for movement and predation.

The body wall of the ringworm is divided into the following from the outside to the inside: **, muscle layer, nerve layer, and coelenteric layer, which is different from roundworms, and has obvious rhythmic properties. As mentioned above, roundworms and ringworms are significantly different in terms of morphology, classification, and biological characteristics.

Summary. Roundworms and ringworms are both animals of the phylum Nematoda, and their body walls are made up of multiple cells. Specifically, their body walls are composed of the outer epidermis, the middle muscle layer, and the inner mucus layer.

These three layers of organization work together to enable roundworms and ringworms to perform a variety of locomotor and life activities. In addition, roundworms and ringworms are slender in size and move by means of body movements. Morphologically, the two also have some similarities, such as the absence of a distinct head and tail, and the body structure is relatively simple.

I'm sorry I don't understand, but can you elaborate on that?

Roundworms and ringworms are both members of the phylum Nematoda, and their body walls are made up of multiple cells. Specifically, their body walls are composed of the outer epidermis, the middle muscle layer, and the inner mucus layer. These three layers of front-line organizations work together to enable roundworms and ringworms to perform a variety of locomotor and life activities.

In addition, roundworms and ringworms are relatively slender and long, and both use their bodies to move by peristalsis. Morphologically, the two also have some similarities, such as the absence of a distinct head and tail, and the body structure is relatively simple.

There are many kinds of animals in nature, and we need to classify animals in limb segments, and the classification of animals should not only compare the external morphological structure, but also compare the internal structure and physiological function of animals than the rubber model It can be seen that a and b are in line with the topic

Therefore, a, b