Chang described two substances which participate in photosynthesis.

substance a: plants absorb sunlight.
substance b: gas formed with glucose.

which statement is correct?

- substance a is chlorophyll and substance b is oxygen.
- substance a is oxygen and substance b is carbon dioxide.
- substance a is glucose and substance b is carbon dioxide.
- substance a is carbon dioxide and substance b is oxygen.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

This map shows how climate change might affect precipitation patterns in the great plains of the united states by the end of this century. brown shoes a decrease in percipitation, and blue shows an increase. the maps differ based on the predictive levels of green house emissions. the maps shows that northern area should get a. more pracipations regardless of emmissions b. less pracipation, regardless of emmissions levels c. more precipitation, but only when emission levels.southern areas show a. more pracipations regardless of emmissions b. less pracipation, regardless of emmissions levels c. more precipitation, but only when emission levels.to use these maps to prepare for natural disasters in the great plains, scientist need to ask? a. how many tons of emissions were used at the basis of the map.b. which types of fossil fuels are used in the great plains c. if you think the above is wrong it's probly c the question is cut off

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.