The smallest particle of an element that has the characteristics of that element:

When 2 or more atoms are bonded together:

When several macromolecules bonded together to form the building blocks of cells.

The smallest unit of life. It is a collection of organelles working together.

Groups of cells working together to perform a specific job.

Groups of  tissues working together

    to perform a specific job.

Group of organs working together to perform a specific job.

Several organ systems functioning together.

Examples: human, dog, tree

Examples: digestive ,cardiovascular, respiratory

Examples: heart, stomach, brain

Examples:  epithelial (protection/material transfer), Nervous 

Examples:  Prokaryotic cells(bacteria), Eukaryotic cells (animal/plant cells)

Examples: nucleus, mitochondria, endoplasmic reticulum.

Examples: Water, carbon dioxide

Examples: Carbon, Hydrogen, Nitrogen, Oxygen,

    Phosphorus, and Sulfur