91色情片

From Darwin himself onward, ants have posed a challenge to evolutionary
biologists: whether it is 鈥渟urvival of the fittest鈥� or 鈥渟elfish genes鈥� how can
it explain altruism among ant workers, who are sterile and leave no
successors? In Social Evolution in Ants (Princeton University Press,
拢19.95/$29.95, ISBN 0 691 04426 0), Andrew Bourke and Nigel
Franks meet this challenge head-on, explaining kin selection theory and all
its ramifications. Not a book for the merely curious or faint-hearted, but
clear and thorough.