How did some stickleback populations come to live exclusively in fresh water? how did some stickleback populations come to live exclusively in fresh water? the ancestors of freshwater sticklebacks are marine stickleback species that lived primarily in the ocean and migrated to freshwater to spawn. stickleback populations swam to freshwater lakes to spawn and stayed because there were no predators. sticklebacks developed traits that made them better adapted to fresh water and, as a result, they moved to a freshwater environment. some stickleback populations became trapped in lakes that formed at the end of the last ice age?

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.

What substance acts to prevent sudden ph changes in bodily fluids?

Which hormone is used by both males and female?