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Oh that's quite simple. Find a sponge and get a bowl. Put the sponge in the water and explain how the pores in the sponge suck in the water as you put pressure on it. As you squeeze it explain that the pores release the water through them.
a sponge
they grow faster on charcoal
I had asked the same thing before but then I figured it out. Out of a flatworm, sponge, coral, or crab, the complex invertebrate is a crab.
The movement of water provides a simple mechanism for feeding respiration circulation and excretion.
Light will not travel through an opaque sponge.
Water is held in the sponge until it is released.
yes!
simple animals
When a sponge is submerged in water, the water enters the sponge through the tiny holes in the sponge. The sponge fills up with water, as a balloon fills with air, only not as visibly. When you squeeze the sponge, the water exits that sponge through the tiny holes...exactly the opposite of how it entered! Tada! :)
The sponge uses the choanocytes to move a steady current through its body.
No, a sponge does not have organs. Sponges belong to a group of simple, multicellular organisms known as poriferans, and they lack well-defined organs or tissue systems found in more complex animals. Instead, sponges have specialized cells performing specific functions within their body structure.