The moon is Earth's only natural satellite. We know now about many of
the moon's characteristics.
Part A Why do people sometimes refer
to "the dark side of the moon"? Explain
why this phrase is incorrect.
Part B Think about the differences
between Earth and the moon. Then
make a plan for a settlement on the
moon. Explain what settlers will need
to take to the moon or change on the
moon to make it suitable for life.

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen