How can life be studied at different levels?

molecules cells organisms populations communities ecosystems biomes atoms : molecules cells organisms populations communities ecosystems biomes the biosphere

Molecules Groups of atoms; smallest unit of most chemical compounds Living things may be studied on many different levels. The largest and most complex level is the biosphere. The smallest level is the molecules that make up living things. Water DNA

Cells Smallest functional unit of life Living things may be studied on many different levels. The largest and most complex level is the biosphere. The smallest level is the molecules that make up living things. Nerve cell

Tissues, organs, and organ systems Groups of Cells Tissues, organs, and organ systems Living things may be studied on many different levels. The largest and most complex level is the biosphere. The smallest level is the molecules that make up living things. Nervous tissue Brain Nervous system

Organism: Individual species that can breed and produce fertile offspring

Populations Group of same species living in the same area

Communities Different populations living together in the same area https://www.youtube.com/watch?v=ezzmkEQILO0 http://www.theguardian.com/environment/video/2012/sep/03/rescuers-stranded-pilot-whales-scotland-video

Ecosystem: community and its nonliving surroundings. 

Biomes: groups of ecosystems sharing similar climates and organisms Biosphere: part of Earth that contains all ecosystems.  

Interdependence in Nature All forms of life on Earth are connected together into a biosphere, which literally means “living planet.”

All of this is studied in the field of Ecology: study of interactions among organisms and between organisms and their physical environment. http://www.underwatersculpture.com/sculptures/anthropocene/

Organization with in organisms Cell: smallest functional unit of life Tissues: groups of same cell types working together Organ: group of different kinds of cells working together Organ System: group of different organs working together Organism: individual living thing

Autotrophs: living organisms that obtain their energy from the sun  

Heterotrophs living organisms that must obtain their energy by eating other organisms.  

Humans: are multicellular heterotrophs.

Biology in Everyday Life More than any other area of study, biology touches your life every day. How? Uh… you’re alive….

Copyright Pearson Prentice Hall Just an increase in size is known as growth. metabolism. development. differentiation. Copyright Pearson Prentice Hall

Which of the following is NOT a characteristic of all living things? use of energy made of cells stable internal environment need for oxygen

Copyright Pearson Prentice Hall 3. The genetic code is carried in Water. DNA. proteins. soil. Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall 4. Which of the following shows the levels of organization in correct order from the simplest to the most complex? organisms, cells, populations, molecules, ecosystems ecosystems, populations, organisms, cells, molecules molecules, cells, organisms, populations, ecosystems molecules, organisms, cells, populations, ecosystems Copyright Pearson Prentice Hall

Copyright Pearson Prentice Hall quickly write the levels of organization from smallest to largest: 1 2 3 4 5 6 7 8 9 atoms molecules cells organisms populations communities ecosystems biomes the biosphere Copyright Pearson Prentice Hall