Both natural and artificial threats can impact the differentiation of species in an ecosystem. Species may actually experience shifts in their genetic makeup due to an enhanced ability of a subgroup to survive and reproduce. This shift is known as natural selection.Which of the following scenarios BEST explains how a natural change in the environment could lead to natural selection?Elimination ToolSelect one answerAAs temperatures get colder in the winter, bears begin to hibernate.BIn the summer, snakes lay on rocks to warm themselves.CDuring winter months, fish slow down all of their body activities to conserve energy.DAfter a forest fire, only darker-colored species are capable of survival.

Natural selection occurs whenMultiple Choicewhen a small number of individuals of a population break away and form a new population.a factor in the environment alters the genetic information in DNA of all members of a species.only when nonrandom mating occurs.a new genetic variation occurs that allows individuals to have a reproductive and survival advantage.

Darwin's theory of natural selection has long been a guiding light for explaining changes in species over time. These changes happen for a number of reasons and are usually based on selective pressure.Which of the following examples is NOT an instance of natural selection?Elimination ToolSelect one answerAA group of giraffes stretching their necks in order to reach more leaves to eat.BA shift in the coloring of beetles over time to blend in with the leaves.CMore nocturnal mice in an area over time due to the presence of daytime predators.DA group of gophers getting smaller over time because they can hide in caves from predators.

Which of the following is natural selection?When a pregnancy is terminatedWhen humans adapt to their environment, e.g. by wearing clothes for warmthWhen a mutation in an organism that makes it better suited to its environment is passed on to the next generationWhen animals or plants are bred by humans to produce desired characteristics

Which statement gives the best example of natural selection?A A frog has a random gene mutation that changes its color.B A bird makes a loud call to attract a mate.C A lizard sits under shade in a hot desert.D A strain of bacteria has become resistant to antibiotics.

Natural selection is the gradual evolutionary change as a result of