Darwin’s Theory of Evolution Novel heritable variations arise. Changes (mutations) in genes New combinations of genes Some variations are more likely than others to be passed on to offspring. Natural selection Sexual selection Genetic drift Accumulated variations may differ among populations divergence speciation.
![Nebraska Advertiser. (Brownville, NE) 1874-10-22 [p ]](https://img.pdfslide.net/doc/110x75/62d359daafd95f60f1324a91/nebraska-advertiser-brownville-ne-1874-10-22-p-.jpg)
![Nebraska Advertiser. (Brownville, NE) 1879-10-02 [p ]](https://img.pdfslide.net/doc/110x75/6195c43519118529a7605f95/nebraska-advertiser-brownville-ne-1879-10-02-p-.jpg)
![Nebraska advertiser. (Brownville NE) 1858-04-29 [p ]](https://img.pdfslide.net/doc/110x75/62bc8c418b130f2bfc21da07/nebraska-advertiser-brownville-ne-1858-04-29-p-.jpg)
