What would a biologist say is the role of nutrients in an ecosystem?
What will be an ideal response?
Nutrients are elements from which organisms construct the molecules of life.
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You toss a ball upward. After it leaves your hand, the force of gravity on it
A. remains constant. B. no longer acts. C. gradually diminishes. D. gradually increases.
Based on a knowledge of the stability of the conformers of cyclohexane, which of the following statements is true about the isomers of 1,2-dimethylcyclohexane?
A) The cis-isomer will have two equatorial methyl substituents in its most stable conformation. B) The trans-isomer will have two axial methyl substituents in its most stable conformation. C) The trans-isomer will have two equatorial methyl substituents in its most stable conformation. D) The cis-and trans-isomers are equally stable.
What is the main energy source for the hydrologic cycle?
a. evaporative cooling b. greenhouse effect c. gravity d. solar energy e. natural gas
A person on the edge of a roof throws a ball downward. It strikes the ground with 100 J of kinetic energy. The person throws an identical ball upward with the same initial speed, and this too falls to the ground
Neglecting air resistance, the second ball hits the ground with a kinetic energy of A) 100 J. B) 200 J. C) less than 100 J. D) more than 200 J. E) none of the above