What type of selection always results in the narrowing of the bell curve distribution of alleles?

Andesitic rocks have mineral compositions between those of and basaltic rocks. a. conglomerate c. granitic b. metamorphic d. organic select the best answer from the choices provided a b c d i need asap

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

Regarding most of the narrator’s story, which word best describes the tone?