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ENVS 1126 – Environmental Science Exam 2 (Aixin Hou) | LSU | Actual Questions and Verified Answers with Complete Solutions | Latest 2025/2026 Update | Fully Explained

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This ENVS 1126 Exam 2 (Professor Aixin Hou – Louisiana State University) guide presents the latest verified collection of actual exam questions and complete, correct solutions, updated for the 2025/2026 academic year. Designed specifically for LSU students, this study resource thoroughly covers population dynamics, ecosystem impacts, atmospheric processes, nutrient cycles, and hydrology, all with clear explanations that align with course lectures and textbook material. Students will gain a solid understanding of essential environmental science principles — including the Environmentalist’s Paradox, dependency ratios, nutrient pollution in the Gulf of Mexico, hydrological changes from urbanization, and major historical revolutions like the Green Revolution. Every answer has been verified and graded for A++ accuracy, making this an indispensable study tool for exam preparation.

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10/14/25, 9:02
AM

ENVS 1126 LSU EXAM 2 (AIXIN HOU) EXAM
QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED LATEST UPDATE


A declining permits decreased spending on education and
dependency ratio old-age medical expenses.
A person who dies of developed country
a heart attack at the
age of 93 is more
likely to have lived
in a
As a cold front moves the warm air rises and condenses
into an area of warm,
moist air, we would
expect to see cloud
formations as
As environmental Enhanced food production has outweighed
systems have declines in ecosystem services.
declined, human
well-being has
improved. What is
the most probable
reason for this
"Environmentalist's

1/40

,10/14/25, 9:02
AM
Paradox"?
At the mouth of the Green Revolution
Mississippi River, large
concentrations of
nitrogen and
phosphorus flow into
the Gulf of Mexico,
causing
nutrient
overloading, algal
blooms, and
extremely low levels
of oxygen. One of the
major revolutions in
human history, the
__________, is most
responsible
for this problem.
Converting forests infiltration has decreased and surface runoff has
to mostly paved increased
urban areas has
largely altered the
hydrology of the
affected
watersheds
because
2/40

,10/14/25, 9:02
AM
Even if a population momentum
developing country
reduces its birth
rate and maintains
replacement-level
fertility, its
population will still
continue to grow
for several
decades because
of____. This
population growth is
due
to the current number
of people in the
childbearing age-
range.




3/40

, 10/14/25, 9:02
AM




Global warming during speed up the hydrologic cycle
the 21st century is
expected to
If a country the population will increase by about 3.2 million
experiences 7 births, 2 people
deaths, and 1 new
immigrant every minute
of a year, how will its
population change in
one year?
If r represents a gene rr
for resistance to DDT,
and to be resistant
an individual must
be homozygous,
choose the
resistant
individual(s) below:
In a country the death rate declines first while the birthrate
undergoing the stays high
demographic
transition,
population growth
occurs because
_______.
4/40

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