​During what stage of meiosis does crossing over take place? Yesterday's question was "How many carbon atoms are in a molecule of propanol?" The answer was 3.

​How many carbon atoms are in a molecule of propanol? Yesterday's question was "What part of the brain links the endocrine and nervous systems?" The answer was the hypothalmus. 

​What part of the brain links the endocrine and nervous systems? Yesterday's question was "What color does copper burn in a flame?" The answer was green. 

What color does copper burn in a flame? Yesterday's question was "Name the protein that transports oxygen to cells via the circulatory system" The answer was hemoglobin. 

​Name the protein that transports oxygen to cells via the circulatory system. Friday's question was "In vascular plants, what is the name of the transport tissue that primarily carries water to the plant?" The answer was xylem.