fossils Ancient remains of living things; includes bone, teeth, and impressions.
nucleus Tiny structure inside of some cells that walls off the DNA from the rest of the
cell; DNA wrapped inside a membrane.
species Group of organisms that can mate with one another to produce fertile offspring
but do not mate with other such groups.
taxonomy The science of naming and classifying organisms.
Points to Consider
- This lesson introduced the diversity of life on Earth. Do you think it is possible for
cells from different organisms to be similar even though the organisms look different? - Do you think human cells are different from bacterial cells?
- Do you think it is possible for a single cell to be a living organism?
Image Sources
(1) CDC. Archaea. Public Domain.(2) Centers for Disease Control and Prevention, United States Department of Health and
Human Services. Bacteria. Public Domain.(3) DNA (nucleic acid). Public Domain.(4) a molecule of glucose (a carbohydrate). Public Domain.(5) http://www.flickr.com/photos/binkley27/2571412895/. CC-BY-SA 3.0.(6) Noel Lee.http://www.flickr.com/photos/noelzialee/329278556/. CC-BY.(7) Just Us 3.http://commons.wikimedia.org/wiki/Image:Silver_maple_5058.jpg.
CC-BY-SA 3.0.(8) http://commons.wikimedia.org/wiki/Image:Carl_Linnaeus.jpg. Public Domain.(9) Paramecium. GNU-FDL.(10) http://commons.wikimedia.org/wiki/Image:
Biological_classification_S_Pengo.svg. CC-BY-SA.
(11) CK-12 Foundation.. CC-BY-SA.