Which of these statements is untestable?
a. the moon is made of the same materials as the earth.
b. the distance between the moon and earth varies during the year.
c. if the moon were closer to earth, people would have colonies on it.
) d. the moon has a greater effect on tides than the sun.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

The us council on environmental quality, the world wildlife fund of the united states, the ecological society of america, the smithsonian institution, and the international union for the conservation of nature have proposed four principles of wildlife conservation. which of the following does not apply to wildlife conservation? a) continuous monitoring, analysis, and assessment b) ecosystem maintenance that includes wildlife c) a plan encompassing entire communities of organisms and all renewable resources d) a continued interest in harvesting populations for sport