Which of the following is NOT true of a physical change? * a. The substance is same before and after the reaction
b. The chemical properties are different
c. One or more physical properties are changed
d. The reaction can be reversed

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

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.

Make a claim about the factors that cause inherited genetic variations within populations. also make a claim about the effects of mutations.