What is the reason that u-238 is different from u-235?

The most salient difference is in how each isotope can be induced to undergo fission. U-235 is fissile, which means that slow-moving neutrons can cause fission.U-238 is fissionable, which means that only fast, energetic neutrons can cause fission. This probably doesn't seem like a big deal, but it really is.

Towns and small farms are usually for land, lakes, rivers, and seas.they also produce other food, like crops.it's also where animals are, where we get our meat.large plantations normally have forests, where crops are grown for sale. (similar to farms)plantations have larger fields of crops.our wine, sugar canes, and fruits come from plantations.