Exam 28: Protists

The following questions refer to the description below. You and a friend were walking through a pet store looking at the different aquaria with fish. Most of the aquaria had fish that were healthy and colourful, but two tanks with many fish in them had fish with "fin and tail rot" caused by a pathogenic bacteria. You and your friend read that bacteria are found in most environments and that healthy fish are quite resistant to bacterial infections. -Test tube 3 contains

Why is the filamentous morphology of the water moulds considered a case of convergent evolution?

Which of the following was derived from an ancestral cyanobacterium?

Living diatoms contain brownish plastids. If global warming causes blooms of diatoms in the surface waters of Earth's oceans, how might this be harmful to the animals that build coral reefs?