Draw a labelled diagram to show water cycle in nature.

In which class would you place any organism which has:

Four chambered heart and lay eggs

In which class would you place any organism which has:

Skeletons are made of both bones and cartilage and are cold-blooded.

Starting from a stationary position, Anil paddles his bicycle to attain a velocity of $10 \mathrm{m} {\mathrm{s}}^{-1}$ in the $25 \mathrm{s}$. Then he applies brakes such that he again comes to rest after next $50 \mathrm{s}$. Calculate the acceleration of the bicycle in both cases. Also, find the total distance covered by Anil.