Homologous structures can be best be described as structures

are so similar that they imply a common ancestor

have the same structures and functions

have the same structures

had a function in an ancestor but don't have that function today

Homologous structures can be best be described as structures that are are so similar that they imply a common ancestor.

Option A

Explanation:

In evolution a number of organisms have lost some of their structures and a number of organisms have gained some of their structures for their survival. According to Darwin , the most fittest organism has survived.

For exhibiting this many organisms have attained several modifications. So when we look into homologous structures in 2 different species we can thereby relate and tell that they are from a common ancestor.

the correct answer is - ability to find a mate

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.