(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.
A factory releases hot waste water into a river. Algae in the river grow rapidly. psle 2012 science questions and answers
(a) Cell wall (or large vacuole or chloroplasts – but onion cells have no chloroplasts; cell wall is best). (b) Controls cell activities / contains genetic material. (a) What is the role of the grass in this food web
(a) In which circuit will the bulb be brighter? (b) Explain your answer. psle 2012 science questions and answers