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Oxygen-18 is a naturally occuring, stable isotope and is commonly used is scientific studies as a tracer. Using the periodic table,
explain the difference between oxygen-18 and oxygen-16.
A)
Oxygen-18 contains 9 protons while oxygen-16 only contains 8 protons.
Oxygen-18 contains 10 protons while oxygen-16 only contains 8 protons,
Oxygen-18 contains 10 neutrons while oxygen-16 only contains 8
neutrons.
Oxygen-18 contains 8 electrons while oxygen-16 only contains 9
electrons.

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which of the following is an example of units for speed

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults