Mangroves are

Which of the following is an indirect ecological factor?

Which of the following is the most ecologically relevant environmental factor?

Organisms that can tolerate only a narrow range of salt concentrations are called . . . . . . .

Hypersaline waters are typically found in:

Organisms that can tolerate and thrive in a wide range of temperatures are $P$,while those restricted to a narrow range of temperatures are $Q$. Choose the correct option for $P$ and $Q$.
$P \quad\quad Q$