scientists use geological time to determine the age of landforms.
they used relative dating to divide earth's past in several chunks of time when similar organisms were on earth. later, scientists used absolute dating to determine the actual number of years ago that events happened. the geologic time scale is divided into eons, eras, periods, and epochs.
answer: (d) carbon dioxide
explanation: carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. small uncharged lipid molecules can pass through the lipid innards of the membrane.
which of the labeled structures in th...