When you shake fish food into in an aquarium, you are contributing to a(n)
A. open system.
B. closed system.
C. negative feedback system.
D. positive feedback system.
Answer: A
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Differentiation refers to the process in which the earth:
a. accreted from smaller terrestrial bodies b. was bombarded by frequent meteorite collisions c. became chemically segregated due to melting and sinking of iron d. became a separate and distinct planetary body along with the other terrestrial planets
What products are obtained when acetamide is hydrolyzed in a solution which contains sodium hydroxide?
A) sodium acetate and acetic acid B) sodium acetate and ammonia C) acetic acid and ammonium chloride D) acetic acid and ammonia
The horizon identified as regolith (weathered bedrock and parent material) is the ________ horizon
A) B B) O C) A D) C E) E
Judge the following sentence according to the criteria given below: A 1-unit change in pH represents a 100-fold change in hydrogen ion concentration BECAUSE pH is not a linear scale
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.