As we grow old, cartilage becomes rigid. Give reasons.

Bone in stronger than cartilage. Give reasons.

mRNA is short lived. Give reason.

Aves and mammals are homotherms. Give reasons.

Aves and Mammals are homeotherms. Give reasons.

Birds are uricotelic in nature. Give reason.

Testis are abdominal in origin. Give reason/Justify.

Swiss cheese has large holes in it'-Give reasons.

State whether the following statements are true or false : ( If a statement is false , correct it and rewrite it.) : As one grows old , ciliary muscles become weak.

Food chains do not exist in isolation. Give reasons.