by definition ld50 is when 50% survive or dead,,answer will be 5 if i count well
They ensure their species survival by having many babies at a time. They also breed frequently and at as young an age as 5 weeks.
I don't believe they can, because if rats from the same family mate, it can cause problem with the young babies, chances are they might not survive or have severe problems
Several rats may survive if it`s a healthy litter the answer may change depending on season and living condition
young rats eat feces from their mother's ramparts
Rats need things like water to survive in their environment. They also need food and a shelter to live in.
Food helps the rats survive.
Rats have very small brains so they don't hate or like anything. They will eat anything, swim underwater, and survive under many circumstances.
it eats rats for food.
Rats are very adaptable. They survive all round the world, in many different climates. They eat everything and anything. Rats will probably not be affected too much by climate change, because they can adapt.
Rats are mammals. Mammals feed their Young on milk.
Horses, Bats, and Rats are all mammals, give birth to live young, and nurse their live young.