13. Molecular clocks based on mitochondrial DNA comparisons are best used to classify (page 315)
a. clades.
b. closely related species.
c. distantly related species.
d. domains.

What is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an

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.

Each member of a class sampled a piece of ptc testing paper. thirty people sampled the chemical. twenty persons were tasters. how many had heterozygous genes? 10 20 0-20 indeterminate