Many human activities influence the amount of CO2 in the atmosphere. Why? Select all that apply
A. Logging removes trees that would
otherwise use CO2 during photosynthesis.
B. Burning vegetation (to make way for
croplands) releases CO2 into the
atmosphere.
C. Using fossil fuels to power vehicles
releases CO2 into the atmosphere.
D. There is no evidence that human activities
contribute to atmospheric CO2 levels.
A,B,C
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In which location would the partial pressure of oxygen be the lowest?
a. inhaled air b. exhaled air c. alveoli d. pulmonary veins e. pulmonary arteries
A genetic family tree can more correctly be called a ________.
Fill in the blank(s) with the appropriate word(s).
As a developing country passes through the demographic transition, which of the following will occur?
A) First, its birth rate will decrease, followed by its death rate. B) Its age structure will change, but its growth rate will remain unchanged. C) Its growth rate will first fall, but later recover. D) Its birth and death rates will decrease simultaneously. E) First, its death rate will decrease, followed by its birth rate.
The prostate produces
A) sperm. B) urine. C) hormones. D) antimicrobials. E) semen.