Which of the following phenomena appears as a ring of light encircling the sun or moon?
A. either a halo or a sundog
B. either a halo or a corona
C. either a rainbow or a halo
D. either a sundog or a crepuscular ray
Answer: B
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The diagram below illustrates the point that the cows are
A) first-level heterotrophs.
B) second-level heterotrophs.
C) primary producers.
D) keystone predators.
Air pollution comes from ____________________ and ____________________ sources
Fill in the blanks with correct word
Why is iron not abundant in the ocean?
a. It is trapped in the Earth's crust. b. It is held in sediments. c. It is nearly insoluble in oxygenated water. d. It is not very reactive.
Explain the principle of limiting factors. Identify examples of biological limiting factors and examples of physical limiting factors
What will be an ideal response?