This paper seeks to identify the factors which have the greatest effect on gas diffusion rates into animal burrows, and in turn on the maximum size of burrowing animals which may rely on simple burrow ...

A comparison between living animals challenges current ideas on the timing of one such change in our ancestors. An early role for ion exchange as gills evolved.

Wet and dry season rates of photosynthesis and stomatal conductance were compared for upper canopy leaves of six species of tropical semi-deciduous forest trees. Photosynthetic rates showed no clear ...