Question

1. darwin made two important observations related to biogeography. in the table, describe each pattern in your own words. in the third column, provide an example of each.

closely related but different

distantly related but similar

Explanation:

• Closely Related but Different: Species that share a common ancestor (closely related) have diverged over time due to different environmental pressures. For example, Darwin's finches on the Galapagos Islands. They all descended from a common finch ancestor. But on different islands with different food sources (e.g., some islands had insects, some had seeds), their beak shapes (a trait related to feeding) evolved differently. Some finches developed long, thin beaks for catching insects, while others had short, thick beaks for cracking seeds.
• Distantly Related but Similar: Species that are not closely related (from different evolutionary lineages, i.e., distantly related) develop similar traits. This is due to living in similar environments and facing similar selection pressures (convergent evolution). An example is the shark (a fish, a type of vertebrate) and the dolphin (a mammal). Sharks are part of the Chondrichthyes class, and dolphins are mammals (class Mammalia). They are not closely related. However, because they both live in an aquatic environment, they have evolved similar body shapes (streamlined bodies) which help them move efficiently through water.

Answer:

Pattern	Description	Example
Distantly Related but Similar	Unrelated species evolve similar traits due to similar environmental conditions	Shark (fish) and dolphin (mammal) (both have streamlined bodies for aquatic locomotion)