Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 has two extra neutrons. These two forms are:
A. oxygen ions.
B. oxygen dimers.
C. oxygen isomers.
D. oxygen isotopes.
D. oxygen isotopes.
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Bull dogs have been bred to have such a large head size that they can no longer give birth naturally. The process by
which these dogs changed over time is called ____.
a. artificial breeding b. artificial selection c. artificial evolution d. artificial engineering e. artificial insemination
Oxygen acts as a final electron acceptor in respiration and is ultimately converted into which
molecule?
a. water b. ATP c. CO2 d. glucose e. phosphate
What is the organelle that runs photosynthesis?
a. Chloroplast b. Golgi body c. Rough endoplasmic reticulum d. Mitochondria e. Lysosome
Permafrost is ____
a. a temporary pool of water in an estuary b. a permanent pool of water in the grasslands c. permanently frozen ground in the polar icecap d. temporary frozen ground in the polar icecap e. permanently frozen layer of ground in the tundra