Question

Which two organisms are most closely related?

Answer 1

Answer:

(B). Brown algae and dinoflagellates.

Explanation:

In a phylogenetic tree, two species are considered as most closely related if they share a more common ancestor than the others. The nodes of tree represent the common ancestor, while the tips of branches represent species originated from that ancestor.

As in given tree, dinoflagellates and brown algae share a common ancestor as they evolved from the same ancestor, they are most closely related to each other.

Thus, the correct answer is option (B).

Answer 2

The answer is B. Hope this helps!
Reasoning: Brown Algae and Dinoflagellates are both on the same branch, unlike other answers.