Which statement about sex-linked traits is true?

Sex-linked traits are always dominant.

Sex-linked traits only occur in heterozygous allele pairs.

Sex-linked traits may be passed from parent to offspring on either the X chromosome or the Y chromosome.

trachea, alveoli, lung capillaries, arteries

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called