Answer:
observation because in order to understand the reason behind it the scientist would have to make some observations
Earthquake and volcanic eruptions are events
The answer to this question would be B. the use of stem cells is without any objections since it can be used in therapies to help humans.
The use of stem cell has many controversies, mostly in the religious group that is pro-life. Since the cell of a zygote is totipotent and be able to differentiate into the most type of cell, it is better to use zygote cells. But some religions consider that cell is already human after fertilization, thus using zygote cells is considered as killing a human.
Human blood cell and umbilical cord are multipotent. There should be no pluripotent in the adult by default, but there <span>is </span>some research about induced pluripotent stem cell (IPSCS) in the adult.
