Which of the following body systems most directly defends the body against pathogens?
a. Nervous system
b. Immune system
c. Respiratory system
d. Endocrine system
Ans: b. Immune system
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The process in which a denser oceanic plate is forced deep below a lighter continental plate is known as ____________________
Fill in the blank(s) with correct word
Which one of the following would be the most practical way to reduce levels of photochemical smog in a city that frequently experiences this problem?
A) Changes in weather that produce more days of sunshine B) Changes in weather that result in more days of fog C) Reducing the amount of electricity generated using windmills D) Reducing the number of automobiles that burn gasoline and the amount of evaporated gasoline
What is the difference between an evergreen and a deciduous forest?
What will be an ideal response?
Biomass in a rain forest is concentrated in the dense mass of overhead leaves of the overstory and canopy
Indicate whether the statement is true or false