American bison were hunted almost to extinction in the late 1800s. The rapid decrease in (species / population / group) size of the bison has reduced the

genetic (equilibrium / evolution / diversity) of the animals. This kind of

(genetic drift / polygenetic shift / environmental effect) likely occurred

because only a few individuals survived from the original larger population. A

change in (habitat conditions / allele frequencies / genetic equilibrium)

following a large reduction in population size is called a(n) (bottleneck effect /

polygenetic effect / environmental effect).

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What would happen if the krill were removed from the food web

The graph below compares the rates of reaction of a burning candle and an exploding firework. comparing chemical reactions what can you conclude from the graph? the reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires less energy to start, and occurs less rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires more energy to start, and occurs less rapidly than the reaction that causes a candle to burn. the reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn. mark this and return

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled