For Plato users...
A. It is a special kind of elliptical orbit.
Nitrogen. The acronym CHON is an easy was to remember these four biomolecules that make up life. Carbon, Hydrogen, Oxygen and Nitrogen are essential for life as we know it. Nitrogen plays a critical role in the construction of proteins and DNA. And Nitrogen is considered essential in the overall process of photosynthesis for the production of chlorophyll in plants.
90% of Earth's ice is found in Antarctica.<span />
C. - because each bead can represent an amino acid.
