1.List 3 substances that MUST pass through the cell membrane. Explain. 2. Hospital patients are usually given intravenous fluid(IVs) to maintain proper levels of Water/salt in the body. If a manufacturer accidentally prepared a batch of IV fluid that had distilled water, harm to the patient could result. Explain how an IV filled with distilled water could harm patients.

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.