View source for Comparative biology

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{{Image|Labrid skulls.png|left|350px|[[Anatomical variability|Diversity]] of the [[skull]] in the [[Labridae|labrid fish]]. (i) [[Cheilinus celebicus]], feeds on small [[fish]]es and [[invertebrate]]s, (j) [[Hemigymnus melapterus]], feeds on invertebrates in sand, (k) [[Anampses geographicus]], feeds on small [[exoskeleton|hard-shelled]] invertebrates, (l) [[Epibulus insidiator]], engulfs [[crustacean]]s and small fishes, (m) [[Chlorurus microrhinos]], feeds on the [[epilithic]] [[alga]]l matrix of [[coral reef]]s, (n) [[Siphonognathus argyrophanes]], feeds on small invertebrates picked from [[weed]]s or the [[substratum]], (o) [[Gomphosus varius]], feeds on small [[benthic]] crustaceans, (p) [[Labrichthys unilineatus]], a [[coral polyp|coral-polyp]] eater.}} 
{{Image|Xenopus laevis and tropicalis with mitotic spindles JCB.png|right|350px|[[Mitotic spindle]]s (bottom) are about 30% longer in [[Xenopus laevis]] (green) than in its smaller, faster-breeding relative, [[Xenopus tropicalis|X. tropicalis]] (red).}}