Q. Statement I: In red algae, union of gametes may take place in water or within the oogonium (oogamous species).
Statement II: Majority of the red algae are marine with greater concentrations found in the colder areas

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Solution:

In brown algae or Phaeophyceae, during sexual reproduction the union of gametes may take place in water or within the oogonium (oogamous species)
Majority of the red algae are marine with greater concentrations found in the warmer areas