Various research centres are studying identical...
Throughout history, the search for salt has played an important role in society. Where it was scarce, salt was traded ounce for ounce with gold. Rome’s major highway was called the via salaria, that is the salt road. Along the road, Roman soldiers transported salt crystals from the salt flasts of ostia up the Tiber River. In return, they received a salarium. The old saying ‘worth their salt’ which mean to be valuable drivers from the custom of payment during the expire.
The word ‘scarce’ means —
Ventures are not careful about what they eat. This makes them vulnerable to eating meat that could be toxic. The consequence often is the death of these birds. That is one reason why these birds are not widely seen in Bangladesh anymore. The other is that the trees which vultures perch on have also been disappearing from the land. The net result is the birds are not present throughout the country in the numbers in which they were viewed a generation, or even a decade, ago.
A suitable title for the passage would be :