The spleen and the thymus work together to fight infection. These organs together make up which next level of
organization?
A) Cells
B) Organism
C) Organ system
D) Tissue

Brian has a medical condition called cone dystrophy, which is a disorder of the cone cells in the eye. what symptoms would you expect brian to have? a. inability to see in the dark b. difficulty determining colors c. difficulty determining shapes and outlines d. inability to see in all light conditions