determine the source of raw materials for plant growth.

About 200 years ago, Jan Baptista van Helmont tried to determine the source of raw materials for plant growth. To do so, he planted a young tree weighing 5 pounds in a barrel filled with 200 pounds of soil. He watered the tree regularly. After 5 years, he again weighed the tree and the soil. At that time the tree weighed 169 pounds, 3 ounces, and the soil weighed 199 pounds, 14 ounces. Because the tree’s weight had increased so much, and the soil’s weight had remained about the same, he concluded that the tree gained weight as a result of the water he had added to the barrel. Analyze his conclusion in terms of the information you have learned from this chapter.

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How do these programs differ from school programs? Are

Survey your local community for agencies that provide services to students with behavioral disorders. These agencies may deal with students who act out or are withdrawn, and may focus on….

Discuss any questions you have about the feasibility and appropriateness of the placement.

Watch a film about individuals who have unusual or disordered behavior. If you can’t think of any recent examples, do a Google search to locate older films such as To….

Design an Experiment The unicellular alga Chlamydomonas reinhardtii has two flagella assembled from tubulin proteins.

Design an Experiment The unicellular alga Chlamydomonas reinhardtii has two flagella assembled from tubulin proteins. If a researcher changes the pH from approximately neutral (their normal growing condition) to pH….