Nor, considered aright, does it seem any argument in favor of the gradual extinction
of the Sperm Whale, for example, that in former years (the latter part of the last century, say) these Leviathans, in small pods, were encountered much oftener than at present, and, in consequence, the voyages were not so prolonged, and were also much more remunerative.
The lower middle class, the small manufacturer, the shopkeeper, the artisan, the peasant, all these fight against the bourgeoisie, to save from extinction
their existence as fractions of the middle class.
Either must he attain the treasure--for so ran the inexorable logic of the shadow-land of the unconscious--or else sink into the all- devouring sea, the blackness eater of the light that swallowed to extinction the sun each night .
Otherwise he would ooze down through the shadow-realm of the unconscious into the all- darkness of extinction.
Thus, rewards strengthen the response in proportion to the magnitude of the reward, implying that large reward should lead, for example, to slow extinction
The road leading to the worst mass extinction
in Earth's history is paved with nickel.
Often, problem behavior is placed on extinction
(reinforcer is withheld; Hagopian, Fisher, Sullivan, Acquisto, & LeBlanc, 1998) to enhance the likelihood of FCT's effectiveness.
The availability of such broad literature dealing with different episodes of mass extinction
supports its importance and interest among the paleontologists and other geoscientists.
May Lok, WRS' director of education, explains: 'Since the history of the Earth's evolution, there have been five mass extinction
, all caused by natural causes such as meteorites and climate change.
and bedtime fading significantly reduced nocturnal wakefulness in infants and maternal stress, according to Michael Gradisar, Ph.
The greatest extinction
in Earth's history might not have been so great after all.
WASHINGTON -- Global warming will eventually push 1 out of every 13 species on Earth into extinction
, a new study projects.
We're in the midst of perhaps the most egregious and far-reaching crime committed in the history of humankind: the mass extinction
of millions of species because of the expansion and reckless consumption of just one species--us.
rates today are probably higher than they've been at any point since the dinosaurs disappeared 65 million years ago.
The history of life on Earth is punctuated by "mass extinction
events:" spasms of upheaval when dozens, hundreds, or even thousands of species were obliterated in, geologically speaking, the blink of an eye.