Answer: A and D
Explanation: pretty simple
prevents backflow into the left atrium
The answer is true as phenotype involves of having to see the organisms character and their morphological features, by this, it is trying to apply to both of the physical and psychological characteristics, making the sentence above as true.
sorry what this means¯\_(ツ)_/¯
1. tetrapods are ( four-limbed animals ) . examples of tetrapods include (extanct and extinct amphibians , reptiles , and mammals )
2. Tetrapods first appear in the fossil record ( 367.5 ) million years ago .
3. Charles Darwin predicted that tetrapods evolved from ( a finned organism that lived in the water) . What observation leads do that hypothesis?( they have “fleshy fins” and “lobe fins”) .
5. Fish use ( gills ) to breathe underwater .
