What is an organism from which others have descended?

Providing immunity by injecting the body with a weakened form a pathogen is known as

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an