Psle 2012 Science Questions And Answers Info

(a) How does the thick stem help the cactus survive? (b) Why are there spines instead of broad leaves?

(a) What is the role of the grass in this food web? (b) If all frogs are removed, explain what will happen to the grasshopper population. psle 2012 science questions and answers

Water from a pond dries up after a few hot days. (a) How does the thick stem help the cactus survive