pKa values for ring nitrogen atoms 1 and 3 in uracil are 

TLS Online TPP Program

#Question id: 8919

#Unit 9. Diversity of Life Forms

The last common ancestor of all animals was probably a

TLS Online TPP Program

#Question id: 8920

#Unit 9. Diversity of Life Forms

Almost all of the major animal body plans seen today appeared in the fossil record over 500 million years ago at the beginning of the

TLS Online TPP Program

#Question id: 8921

#Unit 9. Diversity of Life Forms

Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?

TLS Online TPP Program

#Question id: 8922

#Unit 9. Diversity of Life Forms

Which statement is most consistent with the hypothesis that the Cambrian explosion was caused by the rise of predator-prey relationships?

TLS Online TPP Program

#Question id: 8923

#Unit 9. Diversity of Life Forms

Which of these genetic processes may be most helpful in accounting for the Cambrian explosion?

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.