X appears as silk. It is strong and flexible. Non-availability of X caused riots after world war-II. X is
what is the answer . can you explain
Ritu made some observations on the behavioural pattern of earthworm which are as follows:
(i) When earthworm was placed on the rough surface such as cardboard, it showed fast, wriggling movement.
(ii) When earthworm was placed on hand, it showed less movement.
Above observations prove that ______.
(a) Earthworm cannot sense the difference in its surroundings
(b) Earthworm can respond to changing environmental conditions
(c) Earthworm can move on rough surface only
(d) Earthworm is not comfortable to move on smooth surface