Q1. What are the effects of maternal cocaine use and smoking on fetal growth? Which one of the following is a factor? Cocaine use, fetal growth, receiving prenatal care, prenatal alcohol exposure?

Q2 Modern theory suggests that the early pre-life atmosphere on Earth was a reducing one. Why is it believed that oxygen was not present as life formed on Earth?

Q3. Laila Iskandar Kamel, a winner of the Goldman Prize has worked with people called Zabbaleen to generate a sustainable enterprise. What do these people do?