​If a food chain has four trophic levels, apex predators would belong to which trophic level? Yesterday's question was "If an atom of neutral nitrogen has 7 neutrons, what is its weight in atomic mass units? The answer was 14 atomic mass un

​If an atom of neutral nitrogen has 7 neutrons, what is its weight in atomic mass units? Yesterday's question was "Why do most rocks sink in water?" The answer was because they are denser than the water. 

​Why do most rocks sink in water? Yesterday's question was "What is the measure in degrees of an interior angle of a regular pentagon?" The answer was 108 degrees. 

​What is the measure in degrees of an interior angle of a regular pentagon? Yesterday's question was "Hinge and ball-and-socket are two examples of which kind of body part?" The answer was joint.

​Hinge and ball-and-socket are two examples of which kind of body part? Friday's question was "During what stage of meiosis does crossing over take place?" The answer was meiosis 1.