Answer:
It is normal for there to be veins visible underneath the tongue, partly because the mucous membrane is so thin and translucent in this region, but where these vessels become dilated and tortuous, they may appear round and black like caviar.
Answer:
The biological and socio-cultural aspects of the environment are related to health and population. Human beings, birds, vegetation, insects, animals, etc. come under biological aspects and rules and regulations, customs, traditions, religious places, etc. are socio-cultural aspects.
