Water, or H2O, is compounded using both hydrogen and oxygen. Hydrogen has a positive charge and oxygen has a negative charge. This helps the two compounds to interact with other chemicals such as salt and act as a solvent. The positive charge of sodium links up with oxygen's negative charge, and the positive charge of hydrogen links up with chlorine's negative charge. Oils are not polar however, and would not be able to dissolve, hence why during oil spills, it is a process to clean them up.
The answer would be: C) sexual selection.
Sexual selection happens where one of the individuals choose the partner to sex based on some criteria. In this case, the ability to have a beautiful bower will determinate the ability of the bird to have sex and produce offspring. The criteria are not limited to visual. It could be diverse in other cases, like a deeper croak in frog
They adapt because they can replicate quickly (have many generations within short period of time) and accumulate mutations. Mutations in their genetic information allows them to bypass the host's immune system or resist to antibiotics. These mutations are successfully carried to the next generations of bacteria and allows them to thrive in their new environments. <span />
Geographical variation refers to differences among populations in genetically based traits across the natural geographic range of a species. ... In the simplest case, we divide these factors into purely genetic versus environmental components to tease apart their relative contributions to observed phenotypic variation.