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.
In this article. Tapeworms are flat segmented worms that live in the intestines of some animals. Animals can become infected with these parasites when grazing in pastures or drinking contaminated water. Eating undercooked meat from infected animals is the main cause of tapeworm infection in people.
1 They have a circulatory system and a digestive system. 2  Flatworms, roundworms, and segmented worms are all invertebrates. 3  Some species of each type of worm are free-living, meaning they are not dependent on another organism for food. 4  Segmented worms are the most complex animals of these three invertebrates. Students will then continue with their Internet research to compare flatworms, roundworms, and segmented worms by completing the Worm Comparison worksheet. 2  They should use their research to find more information in order to describe how these three types of worms are similar and how they are different.