I believe it is amino acids?
Answer:
Feathers
Explanation:
For a long time, feathers were regarded as a uniquely avian feature. Bur recent fossil evidence suggests that feathers, too, evolved in theropods before birds.
Answer:
The correct answer is - less efficient signaling.
Explanation:
Second messengers are the molecules that help in transferring the information in the form of intracellular signal that has come from external stimulus.
Second messenger molecules should be short-lived as the concentration of these molecules should be decreased fastly so the cell can be available for other stimuli mediated by the same second messenger.
With increased lifetime, signaling will be less efficient as another stimulus cannot be detected.
Thus, the correct answer is - less efficient signaling.
Is there more information