Astronomy
I have a head and tail, made of gas dust and ice. My tail can be 10 km long.
What am I?
Comet
We are green water plants. We are microscopic. We can be made up of one cell or millions of cells. Zooplanktons eat us
phytoplankton
I am as large as the United States, I am moving away from the Earth one inch every year. Without me there is no tide.
Ocean
We are large pieces of rocks, we are orbiting the Sun. We are located between Jupiter and Mars. What are we?
Asteroids in asteroid belt.