Why Don’t Jellyfish Have Brains? And Other Odd Invertebrate Adaptations

Why Don’t Jellyfish Have Brains? And Other Odd Invertebrate Adaptations — page 3
Incredible Invertebrates Invertebrates are animals without a bony skeleton or backbone They’re the most successful of all animals which means there are a lot of them About 97 percent of all animals are invertebrates and most of these are insects Other invertebrates are corals crabs spiders worms and octopuses Sea sponges and jellyfish are also invertebrates Invertebrates range in size from microscopic to giant kinds of adaptations It’s not hard to find some odd ones Weird invertebrate adaptations include killer poison the ability to live without a brain and even mind control So many different kinds of invertebrates means many THE FIRST CREATURES ON EARTH SEA SPONGE 6 Scientists study ancient creatures through their fossils and they make discoveries every day For a time scientists thought that the first creature on Earth was the ocean-drifting comb jellyfish Now they believe sea creatures called sponges were the first Both these invertebrates still exist today millions of years later