Or, are other inhabited Earth - like worlds common in our galaxy? (kavlifoundation.org)
When the researchers put the sponges under the microscope, they discovered that a single cubic centimeter could be packed with more than 5 x 1010 bacteria, which corresponds to about seven times the number of people inhabiting Earth. (sciencemag.org)
For millennia, humans have marveled at the seemingly boundless variety and diversity of animals inhabiting the Earth. (sciencedaily.com)