That thou givest them they gather: Thou openest Thine hand, they are filled with good.
 Thou hidest thy face, they are troubled: Thou takest away their breath, they die, and return to their dust.
 Thou sendest forth Thy spirit, they are created: and Thou renewest the face of the earth.
These verses declare that all the creatures in this world look to God for their source of food. The source of food for each of these creatures does ultimately come from God even though such creatures don't realize that fact. Note the poetic expression of verse 29, Thou hidest thy face, they are troubled. Obviously, animals and sea creatures don’t have a conscious knowledge of God as humans do but God takes care of all of them.
I am reminded of the fact that Jesus once stated that whenever a single bird dies, God is aware of that fact. (see Matthew 10:29). This chapter has called mankind to worship. The God we worship is aware of all life on this planet.
Always remember that the God who created life is fully aware of all life and He is aware of all things in life. That does not mean we have to focus on animals and plant life all the time. Rather, it simply means that a God that is big enough to know the fate of all life is big enough for us to worship Him as God.