Which came first,Plants or Animals?

Have you ever wondered what it must have been like millions and millions of years ago,When the earth came into existence?Were there plants and animals then?
It is estimated that the first life forms on earth were primitive,one-celled organism that appeared about 3 billion years ago in the ocean.these single celled organism gradually became multi-cellular organisms.in time,the ocean began to fill up with more complex forms of life.
one of the first forms of life was very simple plant celled algae.Different types of plants came later on.Animal life appeared only after the appearance of plant life.............