A variety of an element that is heavier than normal because of the presence of extra neutrons is called
a(n):
a. molecule.
b. electron.
c. ion.
d. isotope.
e. heavy atom
D
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The most widely practiced religion in contemporary Europe is
A) Protestantism B) Judaism C) Islam D) Eastern Orthodox Christianity E) Roman Catholicism
What physical clues and evidence prove that these landmasses were together 225 million years ago as Pangaea, and why do scientists think the continents are drifting (continent and sea-floor movements)?
What will be an ideal response?
The key factor affecting population size is the average number of children born to the women in the population.
Answer the following statement true (T) or false (F)
Judge the following sentence according to the criteria given below: Marine invertebrates such as worms, mussels, and octopuses have not had to evolve special mechanisms to maintain their body fluids at a proper concentrations BECAUSE their body
fluids are hypertonic. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.