Which of the following statements correctly describes any chemical reaction that has reached equilibrium?
A) The concentrations of products and reactants are equal.
B) The reaction is now irreversible.
C) Both forward and reverse reactions have halted.
D) The rates of the forward and reverse reactions are equal.
Ans: D) The rates of the forward and reverse reactions are equal.
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Organisms that fix nitrogen are called:
A. fertilizers B. nitrophiles C. diazotrophs D. nodules E. none of the options listed
An asteroid impact on Earth is often associated with the formation of ____
a. large floods b. erupting volcanoes c. magnetized rock d. fossils e. shocked quartz
Which area, A, B, C, or D, is an area of self-perpetuating embryonic tissue that often continuously grows and produces new tissue during the life of a plant?
1.A
2.B
3.C
4.D
Four of the five features listed below are found in
sponges. Select the exception. a. mesoglea b. spicule c. gemmule d. flagellated collar cells e. amoeboid cells