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.
You should see your primary doctor first. Then they will tell you if you need to see a specialist.
Answer: Larger groups may find it easier to improve their collective skills at tasks such as making fishing nets. ... Through laboratory experiments, they showed that complex cultural traditions — from making fishing nets to tying knots — last longer and improve faster at the hands of larger, more sociable groups.
Explanation: plz mark me Brainliest
