RUESLIUI II PUNTIL)
According to the principle of faunal succession, what must be true of the fossils on a
layer below?
O younger than the fossils above
older than the fossils in the layer above
the same age as the fossils in the layers above
identical to the fossils in the layers above

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

answermeridional ;