The water on the Earth today has been sustaining life for millions of years.

a. True

b. False

The answer is true, water on the earth has been sustaining life for millions of years. Early life had to develop in water because the protective ozone layer had did not exist and so there was no protection from the sun's harmful ultraviolet rays. The first life forms on earth were single celled organisms.

The oldest rocks preserved in the planet contain the earliest evidence of life on Earth. Earth is said to be about 4.5 billion years old however the first signs of life on Earth was only about 3.5 billion years ago. Therefore, water on Earth was able to sustain life that long. The answer is A. True.