The answer is Sensory Receptors
C the earth because that is the only planet around so he thought that the sun and everything else rotated around us.
an element on the periodic table
Anything that relates to sexual reproduction (gametes coming together to fertilize) should be crossed off.
Not much context was provided but you can look back to some other questions I've answered, I have a full in-depth answer to the same question another person had.
