This is a preview. Log in through your library . Abstract Background and Aims Organisms often balance among reproduction, growth and survival. When these processes are in competition, selection may ...

Imagine a photograph of your great-grandparents, grandparents and parents side by side. You’d see a resemblance, but each generation would look distinct from its predecessors. This is the process of ...

There is something otherworldly about ferns. Their fronds suggest feathers and wings, and so when looking at them you may think of taking flight, most likely into the pre-historic past when they ...