The top row shows variation in a zooplankton, Daphnia: the morph on the right is produced in the presence of a predator cue. The second row shows an example of dimorphic variation in horn length, ...
Mammals have evolved an elaborate, multifaceted immune system to respond to the ever-present threat of infection by pathogenic microorganisms. Bacterial, protozoan and fungal pathogens have responded ...
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