LIFE ON A CHANGING PLANET
There are different divisions of time for a reason: the planet isn’t stagnant. Therefore, any
changes (physical or biological) can result in major effects on the life during the time of
Some of these changes include new land formations and movement of plates that
resulted in a redistribution of organisms and natural disasters, such as earthquakes.
Climate change and damaging objects from space have also affected life during Earth’s
history. Organisms and their processes have also affected the life that comes next. For
example, once oxygen-producing organisms began to arise, they paved the way for
oxygen-dependent organisms to exist. Organisms are an integral part of the conditions
of land, water, and atmosphere locations.
Complete questions 1–7 on page 455. Click
to check your answers.
Complete question 8 in the “Check Understanding” section on page 455. Be sure
to review the ways in which events in history have been dated.
© PENN FOSTER, INC. 2015
ASSIGNMENT 12: THE FOSSIL RECORD
REFLECT AND RESPOND