(4) http://commons.wikimedia.org/wiki/Image:Estoma.jpg. GNU-FDL.(5) http://commons.wikimedia.org/wiki/Image:Thylakoid_membrane.png. Public
Domain.(6) CK-12 Foundation.http://commons.wikimedia.org/wiki/File:
Animal_mitochondrion_diagram_en.svg. Public Domain.(7) http://commons.wikimedia.org/wiki/Image:Chloroplast-new.jpg. Public
Domain.(8) http://commons.wikimedia.org/wiki/File:
Mitochondrial_electron_transport_chain.png. CC-BY-SA 2.5.(9) http://commons.wikimedia.org/wiki/File:
Cell_membrane_detailed_diagram_en.svg. Public Domain.(10) CK-12 Foundation.
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(11) http://commons.wikimedia.org/wiki/Image:
Scheme_facilitated_diffusion_in_cell_membrane-en.svg. Public Domain.
(12) Garrett and Kitty Wilkin.
http://www.flickr.com/photos/gareandkitty/244555951/. CC-SA.
(13) http://commons.wikimedia.org/wiki/Image:Pinocytosis.svg. Public Domain.
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