Place the levels of organization in proper order of increasing complexity. v cells
v organs
v chemicals
v organ systems
v tissues

auricle

explanation:

the flaps on the front of the atria are called the auricle.

answer:

i honestly don't know. but for being kind and considerate and trying to make people feel better! people like you show the world that their is still always kindness going around. it means a lot to me (and others! ) that you are trying to cheer people up. we need more people like you! < 3 < 3 < 3

explanation:

spread the love with #notahater !