How commonly people identify themselves as asexuals and aromantics

True or false a fertilized cell divides many times to form an embryo

Witch form of birth control could people use without. altering hormonal systems or blocking sperm from fertilizing an egg

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?