Bilateral symmetry

Bilateral symmetry is the symmetrical arrangement of an organism, along an axis that is in the center.
http://www.myfirstbrain.com/student_view.aspx?ID=36935

Calvin Cycle

The Calvin Cycle is the process of chemical reactions that happen without light during photosynthesis.
http://hyperphysics.phy-astr.gsu.edu/hbase/biology/calvin.html

Phloem

Phloem is the tissue that helps carry organic nutrients to all parts of the plant.
http://vipdictionary.com/phloem

Exoskeleton

The exoskeleton of a tortoise protects the tortoise from its surroundings.
http://www.genehanson.com/critters.htm

Pollen

Pollen is powderlike material found in the center of a flower.  Pollen is produced by anthers of see plants.
http://programmer-art.org/photography/macro-shots

Gymnosperm leaf

Gymnosperm means "naked seeds" the leaves of gymnosperms are modified to form cones.
http://bioap.wikispaces.com/ch22+collaboration

Homologous Structures

Homologous structures are body parts that are similar in different species because they shared a common ancestor.  As you can see the arm shape between these species look alike.
http://bioap.wikispaces.com/ch22+collaboration