Biology

The correct answer is: B. Earthworms and sea stars have a common ancestor.

1. Analyze each option:

“Insects are more complex than mammals.”

The diagram does not provide any information about the complexity of organisms. It only shows possible genetic relationships. So, we cannot conclude that insects are more complex than mammals from this diagram. This statement is not valid.

“Earthworms and sea stars have a common ancestor.”

In a phylogenetic tree like this one, all the organisms shown share a common ancestor at the base of the tree. Earthworms and sea stars are part of the groups depicted, so they indeed have a common ancestor. This statement is valid.

Click "Show Answer" to reveal the answer and analysis