(A) The group $Chrysophyta$ includes diatoms and golden algae (desmids). These organisms are found in both fresh water and marine environments. They a

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(A) The group $Chrysophyta$ includes diatoms and golden algae (desmids). These organisms are found in both fresh water and marine environments. They are mostly photosynthetic and are microscopic, floating passively in water currents (plankton). Therefore, the correct answer is $A$.