Structures that occur in different species but are similar enough to suggest that the species had a common ancestor is

question 2 options:

comparative embryology

homologous structures

phylogenetic tree

The answer is homologous structures.

Homologous structures are structures that occur in different species but are similar enough to suggest that the species had a common ancestor. Simply, they re similar structures shared by different species. For example, amphibians, lizards, and mammals are separated into different classes but they have the similar anatomy of the front limbs. This supports the idea that these groups have a common ancestor but are not that similar to be in the same class.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.