How does the structure of a hummingbird's beak make it more successful in its environment?
a.
it allows gas exchange through the keratin of the beak while the bird is in flight.

b.
it allows hummingbirds to more easily attract mates by making a distinctive call.

c.
it allows the absorption of nutrients directly through the keratin of the beak.

d.
it allows hummingbirds to access certain nutrients more efficiently than other species.

Which group is noted for the independence of gametophyte and sporophyte generations from each other? a) ferns b) mosses, hornworts, and liverworts c) charophytes d) angiosperms e) gymnosperms

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot. active transport involves transport proteins, and facilitated diffusion does not. facilitated diffusion involves transport proteins, and active transport does not. active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.