Awoman treated her home with a pesticide that kills spiders. the first application killed 78% of the spiders. two months later she applied the pesticide again, but it only killed 45% of the spiders. what would best explain the decrease in the effectiveness of the pesticide?

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.