Front

What is a species?

Back

A species is often defined as a group of organisms that can interbreed and produce fertile offspring, but this definition has exceptions.

Front

Why is defining a species challenging?

Back

Defining a species is challenging because some organisms that look different can interbreed, while others that look similar cannot.

Front

What does the similarity in forelimb bone structure among different animals suggest?

Back

It suggests that these animals evolved from a common ancestor that had a similar forelimb structure.

Front

What is variation in biology?

Back

Variation refers to differences in characteristics among individuals of the same species.

Front

What is natural selection?

Back

Natural selection is the process by which organisms with beneficial traits are more likely to survive and reproduce.

Front

What does the presence of gill slits in early embryos of different species suggest?

Back

It suggests that these organisms likely inherited a common set of developmental instructions from a shared ancestor.

Front

What is artificial selection?

Back

Artificial selection is the process by which humans breed organisms for specific traits.

Front

What is a gene pool?

Back

A gene pool is the total collection of genes in a population at any one time.

Front

What is the significance of homologous structures?

Back

Homologous structures are anatomical features in different species that share a common ancestry, indicating evolutionary relationships.

Front

What is the difference between convergent and divergent evolution?

Back

Convergent evolution occurs when unrelated species develop similar traits, while divergent evolution occurs when related species become more different over time.