Question

which sequence represents the correct order of levels of organization found in a complex organism?
a) cells → organelles → organs → organ systems → tissues
b) tissues → organs → organ systems → organelles → cells
c) organs → organ systems → cells → tissues → organelles
d) organelles → cells → tissues → organs → organ systems

Explanation:

Organelles are parts of cells. Cells make up tissues. Tissues form organs. Organs work together in organ systems. So the correct order is organelles → cells → tissues → organs → organ systems.

Answer:

D. organelles → cells → tissues → organs → organ systems