20. Frigatebirds have webbed feet and spend much of their life flying over the ocean but never land in
the water. What does this fact suggest about the
evolution of these physical and behavioral traits?

Compare and contrast the relative importance of the sporophyte vs gametophyte generation between nonvascular plants (bryophytes), seedless vascular plants and seed plants, and explain the ecological significance of a larger sporophyte generation

Isotopes of the same element have differ in their

This is the main structural axis of the plant that supports leaves, flowers and fruits; transports fluids; stores nutrients and produces new tissue.