Why are phytoplankton critical for marine life?
a. They are large contribution to marine food webs
b. They generate massive amounts of atmospheric oxygen
c. They are able to bind billions of tons of carbon into carbohydrates
d. All of these choices
ANS: D
Phytoplankton are important to all life on Earth, not just marine life. They are responsible for binding
at least 35 billion metric tons of carbon into carbohydrates for use by animals. This is 45% of all
photosynthetic food generated on our planet. Information can be found in the section Phytoplankton
are Autotrophs.
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The average speed of a horse that gallops a distance of 10 km in a time of 30 min is
A) 10 km/h. B) 20 km/h. C) 30 km/h. D) more than 30 km/h.
What would happen if a new shipping channel was cut through a barrier island on the east coast of the
U.S. and lined with jetties where there is a strong southward longshore current? a. The shoreline on the north side would widen seaward, and the one on the south would erode and retreat landward. b. The shoreline on the south side would widen, and the one on the north would erode and retreat landward. c. Both shorelines would retreat. d. Neither shoreline would retreat. e. All of the barrier islands would disappear because of erosion.
All regions of any one particular climate type most often occupy similar locations on Earth's surface in respect to latitude and continental position
Indicate whether the statement is true or false
A/An ________ is a series of large tanks that begin with anaerobic treatment and follows with plants and biological life forms that would live in various wetland areas
A) wastewater treatment plant B) septic tank C) septic field D) leach field E) eco-machine