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Old 09-07-2020, 11:36 AM
 
Location: Canada
14,683 posts, read 14,804,674 times
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Quote:
Originally Posted by ukrkoz View Post
What is an Evolutionary Tree?

In the most general terms, an evolutionary tree—also known as a phylogeny Footnote 3—is a diagrammatic depiction of biological entities that are connected through common descent, such as species or higher-level taxonomic groupings. An overwhelming body of evidence supports the conclusion that every organism alive today and all those who have ever lived are members of a shared heritage that extends back to the origin of life some 3.8 billion years ago. One might therefore expect it to be possible, at least in principle, to reconstruct the Tree of Life, branch by branch and bough by bough, from the current diversity residing at the outermost twigs to a universally shared root.
You forgot to include the link to the website you took that article quote from, so here it is. There is a LOT more information there: https://evolution-outreach.biomedcen...008-0035-x#Fn3

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Old 09-11-2020, 04:03 PM
 
5,428 posts, read 3,453,783 times
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Quote:
Originally Posted by Mircea View Post
Indeed.
G- and K-Class Stars are the most abundant in the Universe.


Do G-Class Stars support life? This one does. Our own Sun is a G-Class Star. K-Class Stars are slightly smaller and burn a tad cooler, but all that means is that if our Sun was a K-Class Star then both Venus and Earth would have life.

Once life is found elsewhere, and it will be found, the point is moot.

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Actually, the most common type of Stars are those belonging to the M-Class, which are also known as red dwarfs.

The only problem is that any planet in the habitable zone, would be very close to the star, making it highly probable that it’s tidally locked.
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Old 09-12-2020, 05:07 AM
 
Location: UK
6,905 posts, read 6,812,680 times
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I think I am correct in saying that fossils are very rarely found - in that it needs a very definite set of circumstances for them to form and so leave us the 'evidence' of past life.

I believe fossils to be created when the creature has died in a watery marshy conditions where their bodies have quickly been covered by silt/mud and no predation has occurred. As long as no other animal has dragged off the carcass or eaten the bones, and those bones have been covered over by earth of some kind, then there is a possibility the bones will be turned into rock in the normal process of depositing vegetable matter and pressure over eons to form the fossil. So, for example, you probably wont find fossils formed in an ancient desert where the weather was hot and dry, or up a mountain, or in a forest where there are many animals scavenging for food much of the time. Unless of course, the animal happened to fall into the water of a river where it wasn't eaten before it could be covered over.

As has already been said, we only know what has lived and died by the evidence left behind through fossil records and many fossil records only consist of one or two bones and the rest is 'made up' to be how we think it was. Full skeletons are very rare indeed which is why they are more expensive to buy.

Do I understand this all correctly?
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