Which of the following ecological factors exerts a direct effect on organisms?

  • A
    $pH$
  • B
    Topography
  • C
    Mineral elements
  • D
    Humidity

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Average temperature of thermal springs and deep sea hydrothermal vents exceeds (in $^{\circ} C$)

Phytoplanktons are found in which of the following shallow water region zones?

Which of the following is not a part of the atmosphere?

$A$ - The salt concentration is less than $5$ (parts per thousand) in inland waters.
$R$ - The salt concentration is $30 - 35$ (parts per thousand) in the sea.

Mangroves are

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