The evolutionary removal of the tadpole from the frog life history is a very successful strategy, particularly in the tropics. These direct developers form limbs and a frog-like head early in embryogenesis, and they have reduced or lost tadpole-specific structures, like gills, a long, coiled in...
Amphibians were the first vertebrates to walk on land, and the body shape of newts and salamanders is similar to that of those early ancestors. They havelong, flexible spines (backbones)so their bodies can bend and stretch as they walk. ... This skeleton belonged to a young Japanese giant...
How does a squid swim?Squids:Squids are part of the Molluscs family. They have long, tube-like bodies with an inner shell called a pen. Squids have arms that extend from their bodies and are mistakenly referred to as tentacles. Squids do have two tentacles that remain hidden until they...
The European common frog (Rana temporaria, Linnaeus 1758) is an anuran species belonging to the family of true frogs (Ranidae). R. temporaria is widespread across northern and temperate regions of Europe and large parts of Russia (Beattie, 1985). It is a habitat generalist that spawns in th...
Suppose I claimed to have made an artificial amceba. Prof. McKendrick surely would not deny my claim on the sole ground of my having fail ed to make onE! as larg-e as a frog or a fish, if in all other respects it should be a perfect amceba. Unicellular organisms obviously cannot ...
From the egg, then, the individual developed slowly into a higher form, just as the frog's egg develops through various stages from a fish with gills to a frog with lungs. View in context The canoe whirled with each cunning evolution of the chase, like a bubble floating in a whirlpool;...
tadpole, The fishlike stage in the metamorphosis of a frog and a toad.taxonomist, One who specializes in classification of plants and animals.tendon, Tissue that attaches a muscle to a bone.tentacles, Flexible armlike projections of jellyfish and related animals; used in food-getting and ...