What is ecology?

what are the levels of biological organization from smallest to largest?

Ecology is a branch of Biology that studies the relationship between organisms and their environment.

Biological Organization from smallest

Cell

Tissue

Organ

System

The word ecology comes from the Greek word oikos and the English word ology. Ecology is the study between living organisms. This could include humans and their environment

The levels from smallest to largest is Organelles, Cells, Tissue, Organs and Organ System, (Organisms, Populations, and Communities), Ecosystems and last but not least the Biosphere.