A. disruptive selection
[disruptive selection graph is always bimodal or two-peaked]
Answer:
They are naturally present in the atmosphere in the form of carbon dioxide and gaseous oxygen. Because they're always circulating between the soil, the air, and the water, living matter's constantly renewed. Atmospheric oxygen comes mainly from green plants.
<em>h</em><em>o</em><em>p</em><em>e</em><em> </em><em>i</em><em>t</em><em> </em><em>h</em><em>e</em><em>l</em><em>p</em><em>s</em><em> </em><em>u</em><em>h</em><em> </em><em>!</em><em>!</em><em>!</em>
The best estimate<span> for </span>Earth's age<span> is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, </span>scientists calculated<span> the relative abundances of elements that formed as radioactive uranium decayed over billions of years.</span>
The bond is a PHOSPHODIESTER BOND.
In DNA molecule, the bond that is formed between the sugar of one nucleotide and the phosphate of an adjacent nucleotide is a phosphodiester bond which is a type of covalent bond. Covalent bond involves the sharing of electrons between atoms.