1) Genetic Variation in Species
2) Environmental Changes
3) Competition for Unlimited Resources
4) Gradual Warming of the Earth
2007-03-20 12:26:59 · 8 answers · asked by redneckproud92 1 in Science & Mathematics ➔ Biology
1
2007-03-21 08:19:47 · answer #1 · answered by kat 2 · 0⤊ 0⤋
1
2007-03-20 12:33:48 · answer #2 · answered by wesnaw1 5 · 0⤊ 0⤋
2
2007-03-20 12:46:03 · answer #3 · answered by rizo_rocker 2 · 0⤊ 0⤋
I think 1 is the only one that could be valid. Natural selection can occur even when the environment doesn't change. Competition for unlimited resources doesn't make sense. Warming of earth is not valid.
2007-03-20 12:34:15 · answer #4 · answered by bravozulu 7 · 0⤊ 0⤋
1) Genetic Variation in Species
The source of the variation is mutation
2007-03-20 13:56:54 · answer #5 · answered by Mattyo 2 · 0⤊ 0⤋
1. Genetic variation in species.
2007-03-20 12:32:26 · answer #6 · answered by Anonymous · 0⤊ 0⤋
definitely not 4
2007-03-20 13:22:50 · answer #7 · answered by N A 1 · 0⤊ 0⤋
2
I'd say one as well but extinction is all part of natural selection as well
3 is UNLIMITED so no need to compete
4 isn't real anyways
2007-03-20 12:29:15 · answer #8 · answered by Justin H 4 · 0⤊ 2⤋