Your dad is busy remodeling your basement. He accidentally drives a nail through his right hand with a nail gun. Therefore, you should call the police, asking for an ambulance immiedietly. If ye didn't get help, his hand might become amputated.
Answer:
An aphthous ulcer is an ulcer that forms on the mucous membranes. They are also called aphthae, aphthosis, aphthous stomatitis and canker sores. ... Recurrent aphthous ulcers are mostly a minor nuisance, but they are associated with significant health problems in some people.
Perseverance and persistence i hope this helps
All of the above since they are all caused by a virus.
