The book traces the ways in which terrestrial animals have evolved
from aquatic ancestors and discusses the means by which they are
adapted to life on land. The most important physiological
adaptations are those involving salt and water balance, the
excretion of nitrogen, reproductive mechanisms and the sense organ
and these are given priority. Evidence from fossil history is
combined with that from the ecology and physiology of present-day
species to assess the probable routes along which various
evolutionary lines had moved on to land. Individual chapters are
concerned with specific animal groups and emphasis is placed on
comparisons of physiological mechanisms between closely related
animals before attempting wider generalisations. The book closes
with a brief account of the recolonisation of the sea and fresh
waters by terrestrial animals.
General
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