Why does the rate of breathing increase while walking uphill at a normal pace in the mountains ? Give two reasons.

Why should we conserve forests ? Give two reasons.

As the atomic number increases atomic size increases in a group, while it decreases in a period. Give reasons.

Why does the first element in a group show anomalous behaviour. Give a reason

Why does the first elements in a group show anomalous behaviour. Give a reason.

Two parallel sides of a rectangle are being lenghtened at the rate of 2 cm/sec while the other two sides are shortened in such a way the area of the rectangle is 50 sq. cm The rate of change of the perimeter when the length of an increasing side 5 cm is

Two parallel sides of a rectangle are being lengthened at the rate of 2 cm/sec while the other two sides are shortened in such a way that the aea of the rectangle is 50 sq.cm. The rate of change of the perimeter when the length of an increasing side 5 cm is