The following events are part of a negative feedback mechanism. In which order do they occur? 1. Body temperature falls,
2. Blood flow to the skin and sweating are decreased
3. Sensors detect a temperature change.
4. Blood vessels in the skin contract and sweat gland activity decreases.
O 3,4,2,1
O 1,2,3,4
0 1,3,4,2
0 1,3,2,4

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.