Hawk
Rat
Grasshopper
Grass

I chose Hawk cause they have keen eye sight and they focus on there  pray until they catch it. What animal do you chose?

Explanation:

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.