Which structure of a diatom is rich in silicon?

Why can the use of antibiotics to fight minor illness become a serious problem?

A patient's blood is tested, and the substance found in the blood is living, microscopic, and responsible for the patient's tuberculosis. Which substance is making the patient ill?

Which statement supports the theory that chloroplasts evolved from cyanobacteria?

Animal digestive systems do not function appropriately without the aid of other organisms. In which kingdom do these organisms belong?

Three and a half billion years ago, Earth was much hotter than it is now, and there was little to no oxygen in the atmosphere. Based on these atmospheric conditions, which species originated 3.5 billion years ago?

Microfossils of single-celled prokaryotic organisms have been found in rocks that are at least 3.5 billion years old. What led to the conclusion that single-celled prokaryotic organisms evolved in the absence of oxygen?

A group of biology students wanted to know more about the growth of algae in local ponds. They studied algae living in a sunny pond and algae living in a shady pond. How will the rate of cell division MOST LIKELY differ between the algae?

A dinoflagellate contains two flagella that work together and enable the dinoflagellate to perform which function?

Yellow-green algae and golden-brown algae belong to the phylum Chrysophyta, which means golden plants. Which structure provides the plants with the bright yellow pigments that give this phylum its name?

Which structure helps a euglenophyte locate sunlight to power photosynthesis?

How do immunizations help fight the polio epidemic?

Edward Jenner created the first vaccine in 1796. Which statement explains what Jenner was trying to accomplish?

Which sentence BEST explains a virus's means of replication?

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