Which of the following would be a valid impossibility defense?

a. what the defendant plans to do to the victim is not a criminal act.
b. the bank closes before the defendant can rob it.
c. the victim does not show up at the ambush point.
d. the poison is not strong enough to kill the victim.

How does cloud cover affect how much infrared light is reflected back to the ground?

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?

What is the subcategory of tournament,pageant,match (used as a noun)