Name at least 2 resources that are considered scarce in the world. Why are these scarce?

1: water

2: petroleum

Explanation:

water: Although they seem endless, reserves of essential elements such as water, coal and sand are threatened. Overuse, poor distribution and climatic factors make natural resources increasingly valuable.

Petroleum:

The reserve of fossil fuels on the planet is limited, and if they run out, they cannot be replaced. If we continue at the current rate of consumption, it will lead to depletion. This scenario would be a major challenge for countries like Iraq and Libya, which have large reserves of oil and natural gas.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?