Tetrapods (amphibians, reptiles, and mammals) all share a common ancestor. which of these traits was not present in the common ancestor of all tetrapods (amphibians, reptiles, and mammals):
a. amniotic egg
b. vertebral column
c. digits
d. paired appendages
e, jaws

Amniotic egg.

Explanation:

Amniotic egg is the advanced evolutionary character first appeared in reptiles. These amniotic egg allows the reptiles to colonize on the dry lands. This amniotic egg is covered by hard shell in birds and reptiles.

The amniotic egg is not present in fishes and frogs as they lay their eggs in water. The amniotic egg is present in reptiles, birds and mammals. The vertebral column, paired appendages, jaws and digits are present in frogs, reptiles, birds and mammals.

Thus, the correct answer is option (a).

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

yes

no

blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.