Why plants are considered the earliest forms of life?

At first, there was no life on earth. Then, hundreds of millions of years ago, tiny specks of living matter appeared. These tiny specks were called protoplasm. Scientists tell us that the appearance of protoplasm marks the beginning of all plant and animal life. Some of these specks of protoplasm
Developed thick walls and stayed in one place. These became the first plants. Some developed a green colouring matter called chlorophyll.