What is the main cause of increased erosion?

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

Any sound above what db can cause hearing loss in human beings