Which statement is true about nitrogen and oxygen?
a. they make up about 99.9% of the human body
b. they are both used to make water molecules
c. they are both made of protons, neutrons, and electrons.
d. they both contain no subatomic particles

The statement that is true about nitrogen and oxygen is they are both made of protons, neutrons and electrons.  

Explanation:

Nitrogen and oxygen are important for the survival of life. Oxygen is essential to support respiration and energy deriving process of organisms like human beings.

Nitrogen is the element which is essential for healthy growth of plants. Human body is contains oxygen in the highest percentage.  Oxygen content in human body is 65% and Nitrogen content is 3.2%.Thus they would make up only 68.2% of human body and not 99.9% as given in the first option.

Since oxygen and Nitrogen are elements like every element in the universe are made up of sub atomic particles, Proton, neutron and electron .

individual oxygen atoms are formed during photosynthesis.-c.

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.