Canadian Press: A tiny, prickly fish is helping B.C. researchers understand how organisms evolve in response to new or changing environments. Scientists say that’s a key factor in forecasting how different species might deal with climate change and other human-imposed environmental conditions. The difference between freshwater and marine stickleback, a minnow-sized fish found in lakes, rivers, streams and oceans across Canada, is the focus of a University of British Columbia study that adds …