Why is it important to test one substance at a time when doing an experiment?

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

How does climate change cause the ocean's thermohaline current to slow down?

What is the rate law for the uncatalyzed reaction?