Aristotle
Captain Hooke
Robert Hooke
James Watson
Cellular parts
Organelles
Organs
Celluoplasts
Proteins
Quarks
Cells
Nucleus
Golgi Apparatus
Mitochondria
Endoplasmic Reticulum
20
200
400
1000
Population
Community
Biosphere
Ecosystem
92
48
13
11
Cell death
Cellular respiration
Cell division
Cellular communication
Smooth Reticulum
Chloroplast