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

Which of these groups is characterized by cells that have more than one nucleus?

What is the purpose of the "floats" in some brown algae?

__________ is a protist that causes late blight of potatoes and was responsible for the Irish potato famine of the 19th century.

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 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?

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

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