What is usually responsible for a harmful algal bloom?
a. Diatoms
b. Viruses
c. Cyanobactiera
d. Dinoflagellates
ANS: D
A harmful algal bloom happens when high concentrations of phytoplankton begin to affect nearby
organisms in a negative way. Dinoflagellates are usually the culprits. Some make toxins within their
cells as a by-product of metabolism. This affects marine life through the natural consumption in food
webs. Information can be found in the section Most Phytoplankton are Photosynthetic Autotrophs
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A) directed pressure B) heat C) hydrothermal fluids D) confining pressure