B
Booger
Guest
Great post! The only thing I have to take issue with is the giraffe thing. In my textbook for Evolutionary Biology, Evolutionary Analysis, Third Edition amazon.com/exec/obidos/tg/detail/-/0131018590/ref=wl_it_dp/102-0898739-6599348?%5Fencoding=UTF8&coliid=I1DEWY17JE4Q7W&colid=1SYEVDB8PCWXQDo you know that lesser animals only see in black and white, and that some animals dont have eyes. Evolution is a concept of nessesity, as a species developes over millions of years, they’re bodies adapt. Giraffes with longer necks get more food, and in turn survive, viruses need to grow to survive, such as HIV. People have “evolved” a trait where they and their children can’t use penicillin. It no longer works. Evolution can be benificial or harmful, but if its harmful the creature dies out, obviously!
there is a chapter that mentions a study about the giraffe neck. As it turns out, the giraffes observed did not care to try and reach for the tallest parts of the trees, but rather the middle/lower part of the trees. Giraffes with different lengths of necks all ate from the same part of the tree even if that meant reaching down to eat. However, it also turns out the female giraffes prefer males with long necks, because they are more effective in courtship battles against other males, especially those with shorter necks. So the long neck length may be due to sexual selection rather than the traditional natural selection idea for obtaining food in high places. I don’t own the book anymore, so I can’t give out more specifics.
Also something interesting about HIV from the same book. There are different strains of the virus that affect their hosts differently. One strain will cause host death faster than the other strain. The faster killing strain also reproduces more but is less efficient at spreading than the slow killing strain. The idea is that the host with the slower killing strain typically has fewer partners, so then even though this strain reproduces less, it is more efficient at spreading and has to keep its host alive longer so it will get more chances to spread, even though the chances are few. The other strain reproduces itself very effectively and will get plenty of chances to infect new hosts, so it doesn’t really matter if the host dies because chances are, it *will *spread to new hosts.