Es la suma de las masas atómicas de los átomos que constituyen una molécula expresados en unidades de masa atómica (u. m.a)
a) Peso atómico
b) masa molecular
c) número de masa
d) mol

What causes temperature extremes in the desert

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

After dinner with his brother, charles darwin looked through a book by thomas robert malthus, who believed that humanity, if unchecked, could double its population size in 25 years . why then , wasn't the earth overrun with humans at this point ? how does this relate to the stoning of the darwin's carriage?