The trunks of Palm trees do not get thicker as they age; rather, they simply grow taller. Some Palms have trunks that are as skinny as pencils. Fossil Palm trees date back 100 million years to the Jurassic Era. Muslims regard the Date Palm as the tree of life, as its roots can be traced back more than 5,000 years.
At last count, there were more than 9,000 species of segmented worms on the planet today. Some of the most common types of segmented worms include earthworms, leeches, and sandworms. Earthworms make up the largest and most diverse group of segmented worms in the world. In all, there are more 2,700 different types of earthworms living in every corner of the earth today.
The big difference between roundworms and segmented worms is that segmented worms have a real circulatory system with blood. Many segmented worms also have less developed eyes than roundworms-these segmented worms only have eyespots, like flatworms. But other segmented worms do have more developed eyes. By about 510 million years ago, some of these segmented worms were already evolving into fish. But many of them stayed segmented worms, and there are still lots of segmented worms all over the Earth today, on land and especially in the water.