9) The part of the eye that contains the rods and cones is the?
A) pupil
B) fovea
C) vitreous humor
D) retina
E) lens

that is wrong, its not thymus.

the answer to your question is tooth decay.

in addition to being able to metabolize, grow, digest food, and excrete wastes, what other functions must an organism perform if it is to survive? survival also depends on the ability to maintain one's boundaries, to move, to respond to stimuli, and to reproduce. oxygen is a survival need.

answercells,tissues,organs,organ,system-organism;

levels of biological organization; organism,population,community,ecosystem,biome,biosphere,

hope this .good luck