a. What is the main idea of the video? Write the correct option in the notebook and give reasons for your answer. The video is about how cell phones have changed since they were invented The video is about how heavy car phones were. The video is about how much the first cell phone cost.

Explanation:

{\huge \fbox \pink {A}\fbox \blue {n} \fbox \purple {s} \fbox \green{w} \fbox \red {e} \fbox \orange {r}}

A

n

s

w

e

r

Only the top layer of a lake or river freezes, un- derneath the frozen upper layer the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds