The change in the number of water plants in four ponds, P, Q, R and S, over four months is shown in the graph. Which pond is the most polluted?
A P
B Q
C R
D S
The change in the number of water plants in four ponds, P, Q, R and S, over four months is shown in the graph. Which pond is the most polluted?
A P
B Q
C R
D S