What causes the ""heat island"" effect? a. heat produced from a large number of people b. the materials used in building cities retain heat c. the large amount of reflected light from glass windows d. all of the above

Does this organism still meet the definition of a eukaryote ? why or why not?

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present