Platyhelminthes: The Flat Worms

Platworms known as flatworms, are a group of invertebrate animals with unique characteristics. Found in aquatic and terrestrial environments, they can live freely or as parasites, playing different roles in ecosystems and human health.
Features
With flattened bodies and bilateral symmetry, flatworms have an incomplete digestive system, with only one opening for ingestion and elimination of waste. They do not have a circulatory or respiratory system, which makes them dependent on diffusion for gas exchange and nutrient distribution.
Diversity of Life
Free-living species: Such as planarians, which inhabit aquatic environments and humid soils, playing important roles in the food chain.
Parasitic species: These include tapeworms and schistosomes, known to cause diseases such as taeniasis and schistosomiasis in humans and animals.
Reproduction
Flatworms have a high capacity for regeneration and varied reproductive methods. Many species reproduce sexually, but some reproduce asexually, such as planarians, which regenerate after being divided.
Health Impact
Parasites such as tapeworms and schistosomes affect millions of people through inadequate sanitation and consumption of contaminated water or food.
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Main Invertebrate Groups:
Invertebrates are divided into several groups, with emphasis on insects, molluscs, arthropods and cnidarians. Insects, with more than 10 million species, are essential for the pollination of plants, including those that generate essential foods. Mollusks, such as octopuses and snails, have soft bodies and, in many cases, protective shells.
Common Features:
These animals have characteristics such as the absence of a spinal column and skull, a body made up of several cells, and heterotrophic nutrition, that is, they depend on other living beings for food. Most reproduce sexually and have varied respiratory systems.
Ecological Importance
Invertebrates are essential for the health of ecosystems, with vital functions such as pollination, decomposition of organic matter and control of pest populations. However, many face threats due to pollution and habitat destruction...

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