Changes in the DNA code are called and they can cause a protein to not function properly. A single change in the DNA of the hemoglobin gene will cause cell anemia.

1) mutations 2) sickle cell anemia. Hope this helps you :)

Explanation:

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: