Which of the following groups of algae is/are most closely related to land plants?

In lab class, a plasmodial slime mold is used as a demonstration organism. One of the students does not understand why this organism is not considered multicellular. How would you explain it to her?

Which of the following organisms is commercially harvested to extract algin from their cell walls?

Which of these groups includes unicellular organisms that, due to the structure of their cell walls, can withstand pressures equal to the pressure under each leg of a table supporting an elephant?

What role do diatoms play in the global carbon balance affecting global warming?

On some areas of the seafloor, one could observe an "ooze" that is hundreds of meters thick. What creates this ooze?

Many species of red algae are adapted to deeper water due to the fact that __________.

The most important primary producers in marine ecosystems are .

Which group is incorrectly paired with its description?a. diatoms—important producers in aquatic communitiesb. red algae—eukaryotes that acquired plastids by secondary endosymbiosisc. apicomplexans—unicellular parasites with intricate life cyclesd. diplomonads—unicellular eukaryotes with modified mitochondria