Which sentence is correct? the observers up front were asked to set down so that the ones in the back could see. the observers up front were asked to sit down so that the ones in the back could see.

option c is the correct answer.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.