2007-11-18 01:40:52 · 7 answers · asked by Jack 5 in Science & Mathematics ➔ Biology
1. The paucity of the fossil record.
2. Ambiguity of the fossil record -- it's impossible to know which fossils are of direct lineal ancestors, and which are dead-end also-ran "cousin" species.
3. The Cambrian Explosion. We don't know whether this was a real event caused by some horizontal transfer genetic mechanism that's no longer operating, or if it's simply an artifact of the paucity of fossils of types that are ancestral to the Cambrian forms.
4. There are some things about which we simply must say "we don't know." We don't know much about early life prior to the Oxygen Catastrophe, for example.
2007-11-18 09:53:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
1. is making really selfish humans that is destroying the planet
2. cockroaches
3. mosquitoes
4. humans that are able to develop medicines so that we don't die off within 40 years. Due to that there is an overage of humans on the planet creating 7 billion ppl that keep reproducing (ahem mexicans and asians) and are consuming all of the planets natural resources.
5. bananas
6. george bush
7. dick cheney
8 man bear pig
9. my mom
10. jellyfish
2007-11-18 02:24:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Let's just stop answering Jack's questions which he apparently has nothing to do other than ask every couple hours..
2007-11-18 03:54:46 · answer #3 · answered by Joan H 6 · 0⤊ 0⤋
1. it cant explain why people wont pull their heads out of there as* and think logically.
2007-11-18 01:50:33 · answer #4 · answered by andy g 4 · 0⤊ 0⤋
check on wikipedia.com
2007-11-18 01:53:49 · answer #5 · answered by 06700 2 · 0⤊ 0⤋
one would be the idea of epigenetics...
2007-11-18 02:04:59 · answer #6 · answered by MusicLove 2 · 0⤊ 0⤋
one is me! lol
2007-11-18 02:04:24 · answer #7 · answered by ~hip*hip*hurray~ 7 · 0⤊ 0⤋