Refer to the given dichotomous key.
I. (a) It is a solid waste. - Go to II
(b) It is a gaseous waste. - Go to III
II. (a) It is biodegradable. - Go to IV
(b) It is non-biodegradable. - Go to V
III. (a) It causes acid rain.-P
(b) It leads to global warming.-Q
IV. (a) It can be composted.-R
(b) It cannot be composted. - S
V. (a) It can be recycled. - T .
(b) It cannot be recycled.-U
Select the option that correctly identifies P, Q, R, S, T and U.
