Many plants that grow in tropical rain forests have specialized roots that anchor them to the branches and trunks of trees. they do not harm the trees. these plants get food and water from various sources, including the air and dead organic matter found on the trees. one example of these plants found in tropical rain forests is the bromeliad. its leaves form a cup-like structure that is able to hold water. this water provides a feeding and breeding area for many insects and frogs. snakes and lizards also come to these plants in search of food and water. a cross-section showing the inside of a bromeliad is shown below. which of these terms best describes the wide variety of plant and animal species in the rainforest?

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.