Levels of Organization of Life Presentation based on one from http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

GAIA Ecosphere Ecosystem Organism System Organ Tissue Population Atom Molecule Macromolecule Organelle Cell Tissue Organ System Organism Population Community Ecosystem Ecosphere GAIA

ATOMS Smallest part of matter NON-living

Molecules 2 or more bonded atoms NON-living

Organic molecules carbohydrates, proteins, lipids nucleic acids. Inorganic molecules Water, Salts And vitamins.

Macromolecule Very large molecules composed of many molecules. NON-living

Organelles “Tiny organs” Made of macromolecules

Cell Made of organelles Basic unit of structure & function LIVING

Tissue The same kind cell working together Living

Tissues found in the leaf A tissue is a group of cells of similar structure that perform a shared function Animal tissues: muscle nervous upper epidermal tissue palisade mesophyll spongy mesophyll tissue lower epidermal Tissues found in the leaf Cross-section of a leaf Slide taken from clickbiology.com

An organ is a structure made of a group of tissues working together to perform specific functions Plant organs include the stem and the leaves Slide taken from clickbiology.com

An organ system is a group of organs that coordinate to perform related functions lymphatic system digestive system reproductive system skeletal system endocrine system respiratory system excretory system muscular system nervous system circulatory system In plants the shoot is an organ system consisting of leaves and the stem Slide taken from clickbiology.com

Organism Entire living things (organisms) Usually made of systems May be a single cell Living

Population Same type of organism living together

Community Several populations living together Population interact

Ecosystem A biotic (living) community plus the abiotic (nonliving) features

Biome A Group of ecosystems that share similar characteristics and typical organisms

Biosphere Whole living layer around the globe Includes abiotic features

How do the levels of organization relate to each other?

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