Over the last few weeks we have learned a lot about humans, and impact on their environment. Some say that we have helped make the earth a better place while others say we are doing more harm than good. Take a stance. Do you believe humans have helped improve the earth or caused more harm than good. Why or why not?

Cell specialization occurs by the process ofa. reproductionb. differentiationc. maturationd. growth

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses