Answer:I think the first one
Explanation:
Answer: Electromagnetic waves
Explanation: The main property of the waves is the way how they propagate or travel in medium The waves which can travel without a medium is said to travel in vacuum or air.
<span>harsh conditions.
</span><span>high scalers' work </span>
Answer:
Water concentration,Salts concentration will most likely make it hard for the fish to survive.
Explanation:
Tar and other ingredients found in smoke act as carcinogens which can cause an uncontrolled growth of cells