 Many of the founding figures of evolution supported the idea of "Evolutionary progress" which has fallen from favour, but the work of Francisco J. Ayala and Michael Ruse suggests is still influential.McShea (1998) discusses eight features of organisms that might indicate largest-scale trends in evolution entropy, energy intensiveness, evolutionary versatility, developmental depth, structural depth, adaptedness, size, complexity.He calls these "live hypotheses", meaning that trends in these features are currently being considered by evolutionary biologists.