Individual amoebae of the slime mold dictyostelium discoideum aggregate to form a spore-producing fruiting body. cheaters make spores, but do not contribute to the stalk. since many more spores with cheating genotypes are dispersed, they have higher fitness. why does directional selection not lead to fixation of the cheater genotype?

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases