Why do scientists study deuterium to determine the origins of water on earth? a. deuterium only comes from outside the planet. b. deuterium reacts with oxygen to form water just like hydrogen does. c. deuterium has a neutron in its nucleus, whereas hydrogen does not. d. deuterium is easier to study than ordinary hydrogen.

analyze the map below and answer the question that follows.

what does the map above tell us about the endemity of typhoid fever?

a.

there is greater occurrence of the disease in the western hemisphere.

b.

there is greater occurance of the disease in the northern hemisphere.

c.

countries located in equatorial regions are more likely to have incidents of typhoid fever.

d.

typhoid fever is more rampant among caucasian populations.

a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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