Biomedical Engineering Reference
In-Depth Information
in reaching back into history and pre-history to fine-tune events
within rotations of the earth around the sun that happened at the
terrestrial domain. Cycles within the galaxy may also be linked to
events withinthe fossilrecord.
About the dinosaurs and their extinction Wikipedia says, 'The
Cretaceous-Tertiary extinction event, which occurred approxi-
mately62.5millionyearsago(Ma),wasalarge-scalemassextinction
of animal and plant species in a geologically short period of time.
Widely known as the K-T extinction event, it is associated with a
geologicalsignatureknownastheK-Tboundary,usuallyathinband
of sedimentation found in various parts of the world.' It appears
there was a specific extinction event and this was a major factor,
but it may also be that in addition dinosaurs were structurally
challenged by their size at that point of time in the galactic cycle,
making extinctiondoublycertain.
The largest single living tree is
∼
1,800 tonnes, the largest living
whale is the bull whale at
∼
190 tonnes, while the largest dinosaurs
to have existed were less than half this. There is a gradation of
size here that matches the pressure within the medium of the
organism—soil, water and air. The ancestors of the dinosaurs
includelargeflightlessbirdssuchastheostrich,emu,cassowaryand
rhea.Didthesebirdsloseflightasthepressureintheairdiminished
over the past galactic half-cycle, making flight impossible? Is there
evidence of extinctions within the fossilised record of trees in the
same way that dinosaurs become extinct around 62 million years
ago? If not, why not? And why did whales survive to become the
largest-known mammals and not become extinct at this same time?
Why then were large trees and whales protected within the ground
or the marine environment in a way that dinosaurs were not during
an extinction event? It appears both replicate in a pressurised
environment relative to air and this reduces the relative effect of
any structural stress of the kind discussed in regard to dinosaurs,
where life forms that existed totally in the air were not protected.
Why did smaller terrestrial life forms survive? Why do astronauts
get space sickness? In all these cases acoustic pressure within the
galaxy appears to be acentral factor.
Rather than survival of the fittest, a view at the individual
scale of evolution, the view at the solar system, the galactic and
