Gemstones are used commercially in jewelry because of their beauty, as well as in drill bits, because of their hardness and resilience.
Answer: agriculture Explanation:Im so sorry if im wrong if its not that then hunting!
B. Keratin
Even our nails are made up of it
Answer:
The correct answer is - Trains can have inconvenient schedules, but produce less pollution than cars do.
Explanation:
Trains are expensive to build and also required land for making routes and stations and platforms for passengers but that can be reimbursed by fare in a longer time period.
Trains also produce pollution but in comparison to cars these are way less contribute to the pollution, However, these are not convenient as they start and reach at a specific time and also sometimes not comfortable like cars.
