BIO: DNA helix. Image (c) Jim Caras, National Science Foundation.

DBI: Rice plant (O. sativa) with white/silver hulls growing in a nursery at the International Rice Research Institute (IRRI) in the Philippines. Image courtesy of Susan R. McCouch, Cornell University (photographer) and IRRI for maintaining the international collection of rice genetic resources.

DEB: Artibeus jamaicensis, Jamaican fruit bat, in flight, taking red almond. Image (c) Merlin D. Tuttle, Bat Conservation International.

EF: Individual amoebas aggregate to form what's called a "motile slug." How they interact to do this may help explain how biological social systems evolve. Image courtesy of Kevin Foster of the Strassmann/Queller group, Rice University.

IOB: Male medium ground finch (Geospiza fortis) feeding on a Scutia spicata fruit, on Santa Cruz Island, Galapagos. Image courtesy of Andrew Hendry, McGill University (photographer) and Jeffrey Podos, University of Massachusetts Amherst.

MCB: Myosin V (green), a cellular motor protein, carries cargo within cells by moving along actin filaments (red). It takes 37-nanometer steps by placing one "foot" over the other, as revealed by a fluorophore tag (rainbow-colored oval). Image permission from Science Vol 300, No. 5628, 27 June 2003. Illustration: Precision Graphics. [http://www.sciencemag.org]