Question

fill in the blanks with the correct levels of biological organization.

Explanation:

The levels of biological organization from simplest to most complex are cell, tissue, organ, organ - system, organism. These levels build on each other, with cells being the basic unit of life, tissues made up of similar cells, organs composed of different tissues, organ - systems formed by multiple organs working together, and organisms being the complete living entities.

Answer:

cell → tissue → organ → organ - system → organism