12) Which statement describes why genetie variation can be beneficial to a population? a to decrease the number of disease resistant individuals
b. to ensure that all offspring survive during times of environmental change
c. to increase the chance that some offspring survive during times of environmental change
d. to ensure phenotypic diversity with potential mates for offspring with different physical appearances

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.