Fantastic Animals 1: Vocal Animals
The world is full of wonders. Today, Xiao Zai will bring you to understand
Jellyfish belong to the tubular animal, tubular animals have a simple body structure, most species live in the ocean, jellyfish, sea anemones, sea whips, coral
The above are marine tubular animals, there are also tubular animals in freshwater such as hydra
Tubular animals although with different shapes, but their basic structure is similar, we can learn their basic structure by observing hydra. Hydra likes to live in freshwater where there are many aquatic plants, its body is almost transparent, one end attached to aquatic plants, the other end has a mouth with many soft and slender tentacles around it, we can see that the hydra's body does not divide into upper and lower parts, nor does it divide into front and back left and right, and the body can be divided into multiple symmetrical sections through vertical and horizontal cuts, this form is called radial symmetry
All tubular animals, their main features are radially symmetrical body, the body surface has stinging cells, no anus
Coral, as a member of tubular animals, is becoming increasingly rare due to environmental pollution and global warming, and many marine animals have lost their shelter. Let's cherish these beautiful coral reefs
Xiao Zai also has a question, how do hydra digest food? Welcome to leave a comment in the comment area
