5. What do we know about GLVs?A. They are harmful to humans.B. They are unique to flowering plants.C. They tend to stay in the air for a long time.D. They are released when plants get hurt.6. How may plants react to the GLVs produced by neighboring plants?A. They grow more quickly.B. They produce more flowers.C. They absorb more water.D. They transport resources to their roots. 7. In Paragraph 5, “an older brother” refers to ______.A. a kind of antibioticB. a predatorC. a caterpillarD. a tobacco plant8. According to Baldwin, GLVs can ______.A. tell us whether fruits are ready to eatB. protect plants from pestC. help fruits grow more quicklyD. help people choose delicious fruits