Which element is found in nucleic acids but not in amino acids

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.