Scientists have discovered fossils of the same organisms in many different parts of the world. These fossils provide evidence that * 4 points
the continents were once joined together
most life-forms that existed in the past are still present today
most of Earth’s surface was once covered by molten rock
rocks have been transformed from one type to another

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enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.