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Researchers have studied the cost-effectiveness of growing halophytes—salt-tolerant plant species—for animal forage. ██████████ ███████ ████ █████ ████ ████████████ ██████ ███ ███ ██ █████████ ████ █████████ ███ ███████ ████████ ████ █████ ████ ███ █████ ██ ████ ███████ ████ ███████ ██████████ ████ ████ ██████ █████ ████████ ███████████ ████ ███ █████ ██████ ██ ██████████████ ██ ██████ ███████ ████████ ███ ██████ ███ ███████ ████ ████████████ ██████████ ████████████
Summarize Argument
The author concludes that seawater agriculture should be cost-effective in desert regions near sea level. He supports this by saying that salt-tolerant plants (halophytes) require more water but can be irrigated with seawater, which is much cheaper to pump than freshwater.
Notable Assumptions
The author assumes that seawater agriculture is cost-effective simply because seawater irrigation is cost-effective. He assumes that the benefits of seawater irrigation outweigh any other potential costs of seawater agriculture, like higher fertilizer or equipment costs.
13.
Which one of the following, ██ █████ ████ ███████████ ███ ████████ ██████
a
A given volume ██ ██████████ ██ █████████████ █████████ ██ ███████████ █████ ███ ██████ ██████ ████ ███ ████ ██████ ██ ████████████ ██████ ██████
b
Some halophytes not ████ ████████ ████████ ███ ███████ ████ ██ █████ ██ ███████
c
Large research expenditures ███ ██████ ██ ███████ ███ ███████ ██ ██████████ ████ ██████ ███ ████████████ █████████
d
Costs other than ███ █████ ██ ██████████ ███ █████████ ███ ██████████ █████ ██ █████ ██ ████████ ██████████ ████ ███ ████████████ ██████
e
Pumping water for ██████████ ██ ██████████████ ███ ██ ███ ███████ █████ ████████ ██ ████████ ███████████ ███ ████████████ ███ ██████ ████ ███ ████████