What is causing us to lose species on a daily basis?

Most of the carbon on earth is stored in the form of

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

How would you expect the mrna codons that code for the amino acids that make up hemoglobin to compare between humans