What is natural selection?
Natural selection is the process by which organisms with advantageous traits survive and reproduce at higher rates than those without these traits, leading to the evolution of traits in a population over time.****
A scientist discovers a fossil of an animal and places it in the fossil record. The organism’s bones are similar to the bones of animal T, which appears earlier in the fossil record. Which conclusion is most reasonable? The fossils are from a descendant of animal T.***
Why do organisms evolve? Organisms with traits that help them survive and reproduce in their environment pass on those traits.****
Scientists examine fossils from three different animals. They determine that all three animals share similar structures and record their observations as follows:
Animal A and animal B have somewhat similar structures.
Animal A and animal C have very similar structures.
Animal B and animal C have very similar structures.
The scientists use the similarities to determine the order in which the fossils should appear in the fossil record. Based on the scientists’ observations, which order is the most reasonable? A, C, B****
Scientists discover fossilized bones from two different animals. The scientists consult the fossil record to learn more about the fossils. Which question will the fossil record best answer? Which animal is older?****
How do fossils of the animal Archaeopteryx provide evidence that birds evolved from one group of dinosaurs?
Fossils of Archaeopteryx have traits of both dinosaurs and birds.*****
9 answers
5.
Scientists examine fossils from three different animals. They determine that all three animals share similar structures and conclude that animal A comes earliest in the fossil record, animal C comes latest in the fossil record, and animal B comes somewhere in between. Which set of observations best supports this conclusion?
Animals A and B have slightly similar structures, animals A and C have very
similar structures, and animals B and C have very similar structures.
Animals A and B have slightly similar structures, animals A and C have very similar structures, and animals B and C have slightly similar structures.
Animals A and B have very similar structures, animals A and C have very similar structures, and animals B and C have slightly similar structures.
Animals A and B have very similar structures, animals A and C have slightly similar structures, and animals B and C have very similar structures.
Scientists examine fossils from three different animals. They determine that all three animals share similar structures and conclude that animal A comes earliest in the fossil record, animal C comes latest in the fossil record, and animal B comes somewhere in between. Which set of observations best supports this conclusion?
Animals A and B have slightly similar structures, animals A and C have very
similar structures, and animals B and C have very similar structures.
Animals A and B have slightly similar structures, animals A and C have very similar structures, and animals B and C have slightly similar structures.
Animals A and B have very similar structures, animals A and C have very similar structures, and animals B and C have slightly similar structures.
Animals A and B have very similar structures, animals A and C have slightly similar structures, and animals B and C have very similar structures.
Animals A and B have slightly similar structures, animals A and C have very similar structures, and animals B and C have very similar structures.
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Humans, mice, and giraffes have seven vertebrae in their necks. What can scientists conclude from this observation?
Humans, mice, and giraffes have the same number of bones.
These animals descended from a common ancestor.
Each animal independently evolved this trait.
All vertebrates have seven vertebrae in their necks.
Humans, mice, and giraffes have seven vertebrae in their necks. What can scientists conclude from this observation?
Humans, mice, and giraffes have the same number of bones.
These animals descended from a common ancestor.
Each animal independently evolved this trait.
All vertebrates have seven vertebrae in their necks.
Scientists can conclude that these animals descended from a common ancestor since they share a common anatomical feature, namely the number of vertebrae in their necks.
Which example demonstrates divergence?
Species A and B evolve into species C.
Species A evolves into species B and C.
Species A goes extinct.
Species A does not evolve.
Species A and B evolve into species C.
Species A evolves into species B and C.
Species A goes extinct.
Species A does not evolve.
Species A evolves into species B and C, which demonstrates divergence.
In studying humans, whales, and horses, which of the following set of similarities would be evidence for the most recent common ancestor?
they are all mammals.
they all have hair.
they all have similar bones in their limbs.
they all have internal skeletons.
they are all mammals.
they all have hair.
they all have similar bones in their limbs.
they all have internal skeletons.
They all have similar bones in their limbs would be evidence for the most recent common ancestor. This suggests that these animals share a common ancestor that had similar limb structures, which have been modified over time to suit their different environments and lifestyles.
1 answer