What is the source of all new genes? plz
answers:

parents

mutation

bases

genotypes

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells