Soil mineral particles that range from 2.0?0.02 mm in diameter are called
a. sand.
b. humus.
c. clay.
d. silt.
e. macroparticles.
A
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The experimental approach taken in current biological investigations presumes that _____
A) simple organic compounds can be synthesized in the laboratory from inorganic precursors, but complex organic compounds like carbohydrates and proteins can be synthesized only by living organisms B) a life force ultimately controls the activities of living organisms and this life force cannot be studied by physical or chemical methods C) living organisms are composed of the same elements present in nonliving things, plus a few special trace elements found only in living organisms or their products D) living organisms can be understood in terms of the same physical and chemical laws that can be used to explain all natural phenomena
What is the term for organisms in which internally-fertilized eggs are laid to develop and hatch outside the mother's body?
A. Viviparous B. Marsupial C. Ovoviviparous D. Placental E. Oviparous
As males and females age they produce lower volumes of sex hormones. For women, taking
testosterone to increase libido in becoming more common. Why is the same not common for males? What will be an ideal response?
How has climate change altered the mountain pine beetle?
A) They are being outcompeted by the prairie pine beetle. B) They now have two generations per year. C) They have decreased the average elevation of their distribution. D) Their abundance has increased through lack of predators due to mismatched phenology.