Prostaglandins are local regulators whose chemical structure is derived from ________.

TLS Online TPP Program

#Question id: 8924

#Unit 9. Diversity of Life Forms

Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

TLS Online TPP Program

#Question id: 8925

#Unit 9. Diversity of Life Forms

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

TLS Online TPP Program

#Question id: 8926

#Unit 9. Diversity of Life Forms

Sponges and cnidarians are among the fossilized animals found in both the Ediacara Hills and the Burgess Shale from the Rocky Mountains of British Colombia. This observation requires that

TLS Online TPP Program

#Question id: 8927

#Unit 9. Diversity of Life Forms

Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that

TLS Online TPP Program

#Question id: 8928

#Unit 9. Diversity of Life Forms

An adult animal that possesses bilateral symmetry is most certainly also

TLS Online TPP Program

#Question id: 8929

#Unit 9. Diversity of Life Forms

An obsolete taxon, the ʺRadiata,ʺ included all phyla whose adults had true radial symmetry. Today, the ʺRadiataʺ is more correctly considered to be

1. a clade.

2. a grade.

3. monophyletic.

4. paraphyletic.

5. polyphyletic.