Being the only child is a unique position in a family. Without any siblings to compete with, the only child monopolizes his parents' attention and resources, not just for a short period of time like a firstborn, but forever.
Like gravity and plate tectonics, evolution is a scientific theory. In science, a theory is the most logical explanation for how a natural phenomenon works. It is well tested and supported by abundant evidence. It means quite the opposite from our informal use of the word theory, which implies an untested opinion or guess. As a scientific theory, evolution enables scientists to make predictions and drives investigations that lead to new kinds of observable evidence.
LINK / CITE ADD TO WORD LIST. noun. The definition of a geologist is a person who studies the history of the earth through rocks and rock formations. A person who uncovers rocks from the earth's core and who studies those rocks to try to understand them and what lived there is an example of a geologist.he definition of a geologist is a person who studies the history of the earth through rocks and rock formations.