What is biological sex?

a)an individual’s self-concept of being male or female
b)the way people communicate their gender within their culture
c)being male or female based on the number of chromosomes someone has
d)a person’s sexual and romantic attraction to people of the same sex, the opposite sex, or both sexes

Biological sex: corresponds to the sex with which it began, determined by chromosomes.

The concept of being female or male depending on the chromosome numbers in an individual.

Explanation:

The biological symbols or units that refers to an individual’s identity of being male or female is referred to as ‘biological sex”. The factors that determines this identity that is imposed by the doctor from the time of birth of an individual refers to the - genitals, chromosomal numbers and hormones too.

This label of identity differs completely from the gender concept. Gender is something that is regarded as social and sex is purely biology-based identity of a male and female individual.

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?