The world of INVERTEBRATES vol II | Vela Productions

Описание к видео The world of INVERTEBRATES vol II | Vela Productions

Do you like invertebrates? This is your place.
Take a look and enjoy with this amazing creatures, the world of invertebrates vol II

Out of the five kingdoms for classifying living organisms, the animal kingdom contains by far the greatest number of known species. Traditionally, species were classified into two major groups: vertebrates and invertebrates. Vertebrates are animals with an internal spinal column: fish, amphibians, reptiles, birds, and mammals. In contrast, invertebrates are animals that do not have a spinal column.

Invertebrate, any animal that lacks a vertebral column, or backbone, in contrast to the cartilaginous or bony vertebrates. More than 90 percent of all living animal species are invertebrates. Worldwide in distribution, they include animals as diverse as sea stars, sea urchins, earthworms, sponges, jellyfish, lobsters, crabs, insects, spiders, snails, clams, and squid. Invertebrates are especially important as agricultural pests, parasites, or agents for the transmission of parasitic infections to humans and other vertebrates.
Invertebrates serve as food for humans; are key elements in food chains that support birds, fish, and many other vertebrate species; and play important roles in plant pollination. Despite providing important environmental services, invertebrates are often ancillary in wildlife research and conservation, with priority given instead to studies that focus on large vertebrates. In addition, several invertebrate groups (including many types of insects and worms) are viewed solely as pests, and by the early 21st century the heavy use of pesticides worldwide had caused substantial population declines among bees, wasps, and other terrestrial insects.


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