Examine Figure 44.1, below. According to this phylogeny, which of the following CORRECTLY lists the sequence in which multicellularity, tissues, and bilateral symmetry arose, from the oldest characteristic to the most recent?

Question

Examine Figure 44.1, below.  According to this phylogeny, which of the following CORRECTLY lists the sequence in which multicellularity, tissues, and bilateral symmetry arose, from the oldest characteristic to the most recent?

Quizplus · Accepted Answer

In the given phylogeny, the oldest characteristic is multicellularity which is present in all the organisms listed. The next characteristic to arise is tissues which are first seen in Cnidaria. Finally, bilateral symmetry is the most recent characteristic which is present in all the organisms after the split between Cnidaria and Bilateria. Therefore, the correct sequence from oldest to most recent is multicellularity, tissues, bilateral symmetry.