1. Activities Ch 5, 6

2. Amino acids Na+ CO2 K+ cholesterol glucose H20 Cl- estrogen Put a D, P, or A (diffusion, passive transport, active transport)

3. One hypothesis concerning the extinction of the dinosaurs 65 million years ago states that a giant asteroid collided with Earth. As a result, a huge cloud of dust filled the atmosphere. Sunlight would have been blocked for several months or even longer. – How might this affect plants around the world? – Suggest two ways in which a problem with plant life could affect dinosaur populations.