Question

1. (4 points) In a landmark 1979 paper with an absurdly long title (look it up for a laugh), Gould and Lewontin laid out an argument against automatically considering that all organismal structures, functions, and traits are adaptive in nature. Statement 1. This paper laid the groundwork for researchers to recognize that bird/dinosaur feathers are likely not adaptations for flight. Statement 2: However, we also know that different types of feathers are adaptive for different aspects of flight. For instance, peregrine falcons have particularly elongated wing feathers that are considered an adaptation for extremely fast flight - peregrines are in fact the fastest living animals on the planet. a. How do we know that feathers in general are not an adaptation for flight (related to statement 1)? for boule

Answer 1

re ming on De : a) It is hupothesized that blig get started with non-avian dinosaurs free trunks by Wring their feathers as proto-wings to produce some thorst & in partialar, gup. This may sound strange, but it is experienced by a number of birds, Counting juveniles that don't deudop full wings & adult plumage. All of these would do to the Non-avion dinosaurs. Cuen a few of Smallest feathers might have revered in a bit too late warnnees a allowed for a new color pattern to facilitate sigral to the males ete, So Sorell advantage would be there that would build up as feathers in dimension, Complexity, shape, & exposure of the animal. Our time in response to evolutionary at selective presures, the feathers are sidued La Light purpose changu .Leathas are sidued we prej wles, Some of the birds, such as vultures & aq engles have very large feathers. They are capable to by high in the sky & mode a wick. They are able to do this because they locate the places where heat is ircuasing from the land. The heat cuats the air to move in an upwards driction. The air mm

Page -2. which is nowing upwards thoust annat the large feathers of these biseda e euphold them in the case. I The bisode Wesely red to move their wurge at all. The flight feathers are to Suport in the generation of both lite e thout thereby alle fight. The Right d of premory, Secondary of feathers. The primary feathers are Right in the air. The Secondary feathers sms along theam the air by giving it a lift. The taxitary feathers of the wling kaup op hun bon coin hindi Small, in most flight feathers on the lar bosden hear to the body of the burd. They Dod o vertini Leo Right 'as the questing on the of the bird. They are the wung Secondary feature please give a positive wote