1 | Like charges repel each other,unlike charges attract each other. | |
2 | Sometimes the escaped fish interbreed with wild fish to the detriment of the local stock. | |
3 | Will these alien genes harm the fragile ecosystem upon which we all depend? | |
4 | Many patients with heart transplant a pig or cow valves, they are dissimilar chimera . | |
5 | DNA has even shown that a few Neandertals interbred with our ancestors. |