How to Define Life[Biology intro]
Subject:
Living Things Are Organized
Organization of living systems begins with atoms, which make up basic building blocks called elements.
The cell is the basic structural and functional unit of all living things.
Different cells combine to make up tissues (e.g., myocardial tissue).
Tissues combine to make up an organ (e.g., the heart).
Specific organs work together as a system (e.g., the heart, arteries, veins, etc.).
Multicellular organisms (each an "individual" within a particular species) contain organ systems (e.g., cardiovascular, digestive, respiratory, etc.).
A species in a particular area (e.g., gray squirrels in a forest) constitutes a population.
