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| Authored by: Anonymous on Monday, February 11 2013 @ 01:07 PM EST |
How then did they survive the ice ages also? One observation
is that the male/female ratio of eggs born under different
thermal conditions do changes. Perhaps it is possible they
have other kinds of adaptive genes that are triggered by
specific environmental conditions, too. That is to say, an
individual born in a specific environment may be very
sensitive to variation, but the species as a whole has
significant and normally unexpressed genes that cover and get
triggered by vastly different conditions. This is presumably
a testable hypothesis, too.[ Reply to This | Parent | # ]
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| Authored by: Wol on Monday, February 11 2013 @ 01:56 PM EST |
Amphibians are cold-blooded.
That means they are capable of operating at a variety of different temperatures.
They may be sensitive to temperature but the main effect is they go lethargic or
hyperactive (some can quite happily survive being frozen). Neither are
necessarily fatal.
Mammals (and other warm-blooded species), on the other hand, are far simple
beings in that sense. They are designed to operate at one temperature, and at
one temperature only. If the external temperature is wrong they either have to
burn masses of food to keep warm, or they cook. Both are quickly fatal.
So, as far as staying alive is concerned, I'd actually say that humans and other
mammals are far more sensitive to temperature than amphibians!
Cheers,
Wol[ Reply to This | Parent | # ]
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- But - Authored by: Anonymous on Tuesday, February 12 2013 @ 07:21 AM EST
- Amphibian survival - Authored by: Anonymous on Tuesday, February 12 2013 @ 08:49 AM EST
- But - Authored by: Wol on Tuesday, February 12 2013 @ 03:10 PM EST
- But - Authored by: Anonymous on Wednesday, February 13 2013 @ 06:19 PM EST
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