When comparing the DNA of two species, the more similar the DNA sequences, the more ____ related the species.
Darwin studied birds that were different from one island to the next. They were different species of _______.
Scientists can compare the order of ______ ______ in a protein to see how closely related two species are.
An organism's body structure is its basic body plan, which in vertebrates includes how its ____ are arranged.
A scientific ______ is a well-tested concept that explains a wide range of observations.
Evidence from ______ and protein structure has confirmed conclusions about evolutionary relationships based on fossils and other evidence.
Over time, different finches developed different ______ shapes and sizes that were well suited to the food that they ate.
________ means that most species produce far more offspring than can possibly survive.
Similarities in the development of the embryos of different species suggests they share a _______ ancestor.
Darwin was a _______, a person who observes and studies the natural world.
Members of a species can be cut off from the rest of the species when a natural ________ such as a river, separates group members.
The change of a species over time is called _____.
Charles Darwin traveled around the world on the British ship HMS _______.
The _______ selects organisms with helpful traits to become parents of the next generation.
A ______ is the preserved remains or traces of an organism that lived in the past.
Down
There is ______ among members of a species because food, space and other resources are limited.
Natural ______ is the process by which individual that are better adapted to their environment are move likely to survive and reproduce.
Similar structures that related species have inherited from a common ancestor are known as _______ structures.
Darwin discovered many differences among organisms on the different _______ Islands.
Darwin was amazed by the _______ of living things. That is the great variety of living things.
An _____ is a trait that increases an orgamism's ability to survive and reproduce.
_______ states that evolution occurs slowly and steadily.
Any difference between individuals of the same species is called a ______.
In an effort to understand how evolution may have occurred, Darwin studied the _____ selection of domesticated animals.
______ equilibrium is when a species remains unchanged for a long period of time then shows rapid change in a short period of time.
Some traits become more favorable and lead to evolution when the environment ______.
Darwin described his explanation for how evolution occurs in his book "The _____ of Species".
Scientist infer evolutionary relationships by comparing the _____ development of different organisms.
A new species can form when a group of individuals remains ______ from the rest of its species long enough to evolve new traits that prevent reproduction.
The bones in a bird's wing, a dolphin's _____, and dog's leg have similar structures.
A ______ is a group of similar organisms that can mate with each other and produce fertile offspring.
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It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
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