Evolution: where did cyanobacteria come from? (Introduction)

by David Turell , Monday, June 19, 2017, 15:07 (2501 days ago) @ dhw

DAVID: Partially wrong. The Cambrian animals were created after oxygen appeared. Not before. Only the whales appear to fit your comment.

dhw: I sometimes find it difficult to keep up with your different opinions. You told us your God also restructured hominins before they descended from the trees to the plains (“bacterial intelligence”, 24 May: “Speciation first, environment second”) and actually I thought the whales were meant to be a prime example of your God’s advance planning. However, so long as we agree that environmental change can trigger the process of speciation, we can move on.

You are correct. I had forgotten that bipedalism skeletal changes appear before Lucy's decedents fully left the trees. But in these examples the changes are in areas of living as environmental change, not Earth's environmental change as in oxygen concentrations. Area change requires pre-planning. As for your word 'trigger' I don't like any more than 'initiate' both of which imply causation, but I now know you have a different view of he meaning of those words. I prefer that changes 'allow'.