An engineer measures the energy consumed by an appliance and compares it with the useful energy put out by the appliance. Dividing the energy output by the energy input
results in a value of 24%. Which of these has the engineer measured?
A. Energy crisis
C. Energy conservation
D. Energy efficiency

Which of the following observations 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 can be found on islands located farther from the mainland than the birdsê¹ maximum nonstop flightdistance.d) south american temperate plants are more similar to the tropical plants of south america than to thetemperate plants of europe.e) earthquakes reshape life by causing mass extinctions.