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Snowball

snowball

1. A round mass of snow pressed or roller together, or anything resembling such a mass.

2. (Science: botany) The Guelder-rose. Snowball tree.


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Re: Fascinating Creatures

[quote="snowball"]Hi everyone. My extent of zoology is one college course, many years ago. Not sure if it is just my end but I can't seem to bring the image up to full size? it is only 150x112 anyway, it is really strange ...

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by vk4vfx
Fri Sep 28, 2012 10:36 am
 
Forum: Zoology Discussion
Topic: Fascinating Creatures
Replies: 4
Views: 4406

Photosynthesis Theory..

... event in Earth's history. Additionally the free oxygen combined with atmospheric methane, triggering the Huronian glaciation, possibly the longest snowball Earth episode ever.

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by bellyjelly
Tue Jul 12, 2011 10:06 am
 
Forum: Botany Discussion
Topic: Photosynthesis Theory..
Replies: 12
Views: 14051

Re: Evolution of sexual reproduction

... formation of East Greenland, Siberia and others. Can you be a little more precise? To what Cambrian strata are you referring.? (3) following the Snowball Period reradiation, some rapid changes are to be expected. The snowball earth hypothesis is considered to have come before the Cambrian period ...

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by jevg
Wed Aug 25, 2010 9:47 pm
 
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 32491

Evolution of sexual reproduction

As more fossil beds are found, the Cambrian Explosion is looking more artifactual. The changes were pretty quick, but following the Snowball Period reradiation, some rapid changes are to be expected. Darwin was a uniformitarian, but that hasn't been the prevailing attitude for half a century.

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by Darby
Tue Aug 24, 2010 9:41 pm
 
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 32491

invertebrate to vertebrate fossils out of order?

... and the ones that exist may be from very different environments well-separated on the planet, especially with the "recent" end of the Snowball Period. The Cambrian Explosion is at least partially an artifact of that problem. I don't see why the appearance of vertebrates during that ...

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by Darby
Sun Oct 12, 2008 7:47 pm
 
Forum: Evolution
Topic: invertebrate to vertebrate fossils out of order?
Replies: 2
Views: 3316
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