because they are easy to breed and fast to breed so they have them when ever they want
the Rattus rattus or the black rat
Scientists use Mice for experiments because they reproduce rapidly.
It is illegal to use humans. Rats and mice are inexpensive and easy to keep.
mice sheep
No its not illegal,scientists carry out multiple tests.
mice
Yes, they are, nand are not related to any type of bird. They are very much like mice.
Scientists have mapped the whole human genome but are still mapping other species genomes such as mice and worms
In 1981.
Because Mice are mammals, Like humans, so the reaction that the mice have is likely to be like human reactions. It's also safer, because people think that humans are superiour to mice etc. So if something goes wrong it's less likely to be a big 'oh my god! Noo!' type thing.
Some are. Scientists have found a genetic trait in lab mice that make some prone to homosexual actions while others are heterosexual
Yes mice's is correct for the plural possessive of mice.