Levels of Organization from smallest to largest Subatomic particles atom molecules macromolecules organelles cell tissue organ Organ system organism population community ecosystem biome biosphere

From simplest to most complex: Subatomic particles Atom Molecule Macromolecule Organelles Cell Tissue Organs Organ system Organism Population Community Ecosystem Biomes Biosphere

Subatomic particles electrons outside nucleus; negative charge; small mass protons in nucleus positive charge neutrons in nucleus no charge involved in Energy transformations, Radioactivity, subatomic reactions and particle formation

ATOMS The basic building blocks of all matter, living and non-living Smallest part of matter NON-living The basic building blocks of all matter, living and non-living EX: Hydrogen, Oxygen, Nitrogen…

Molecules 2 or more bonded atoms Form compounds EX: H2O, CH4 , Acids, Salts, Alcohols, Amino Acids NON-living

Macromolecule Large network of molecules Proteins, fats, carbohydrates, nucleic acids NON-living

Organelles “Tiny organs” made of macromolecules Organelles: specific function “parts of cell” - transfer of materials across membranes, photosynthesis, oxidation EX: nucleus, ribosome, lysosome

Cell Cell: smallest functional unit of life Made of organelles Cell: smallest functional unit of life EX: neurons(brain cells), lung cells, cardiac cells (heart cells) LIVING

Tissue Cells of one type working together Specialization in performance of one function for the benefit of entire organism

Organs Multiple types of tissues that work together Ex – Brain, lungs, heart Living

Organ System Multiple organs with common theme EX: nervous system (brain, spinal cord and nerves)

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

Population All the members of one species in a specific area Same type of organism living together All the members of one species in a specific area EX: “pack of wolves”

Community All the organisms within a specific area: many species Population interact

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

Biome General areas with uniform plant life due to levels of precipitation and temperatures.

Biosphere Includes abiotic features Whole living layer around the globe Includes abiotic features http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

https://www.youtube.com/watch?v=28ueTHq_fLw

Review questions What level of organization would a puddle in your driveway be? What level is the tundra? What level is a colony of ants? What level is a protein? What level is a finger? What level is oxygen gas? What two parts of an atom are in the nucleus?

Review questions What level of organization would a puddle in your driveway be? Ecosystem What level is the tundra? Biome What level is a colony of ants? Population What level is a protein? Macromolecule What level is a finger? Organ System What level is oxygen gas? Atoms What two parts of an atom are in the nucleus? Protons and Neutrons

Question 1 Which of the following is defined as “the living part of an ecosystem?” A. biosphere. B. community. C. organism. D. population. E. ecosystem.

Question 2 Which of the following is defined as “group of individuals of a particular type that live in the same area and actively interbreed with one another?” A. ecosystem. B. community. C. population. D. organism.

Answers Question 1: B. community. Question 2: C. population.