You need a service dog to help someone in a wheelchair. What traits would you want the dog to have? Why?

You would have the dog for retrieval, pushing buttons, and possibly depending on the dog puling the wheelchair.

Retrieval because they can't get stuff off the ground, pushing buttons because they might not be able to reach and pulling the wheelchair if the handler has a medical episode and can't do it themselves.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion