Which of the following is the best example of a secondary source?
a. the diary of anne frank
b. a text book discussing the causes of wwii
c. a photo featuring a farmer collecting his crop
d. a television interview with a person who survived hurricane katrina

Photosynthesis converts light energy to chemical energy. which molecules are the end product of this transformation of energy in this reaction?

(drag each tile to the correct identify which questions can be answered by what can be answered by science or which cannot. -is it right or wrong to use genetic engineering to produce new food products? -what are the most common social settings that tend to produce accomplished artists? -if a new gene is added to the genome of a tomato species, will that species be more resistant to insects? -should humans use biotechnology to bring extinct organisms from the fossil record back to life? -do the types of organisms found in the fossil record appear in consistent sequences in different parts of the world? -are michelangelo's paintings more impressive than rembrandt's?

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?