George wang

For which value of x is the expression 3/x-2 undefined?

A vaccine can protect you against a disease because it (1)destroys toxic substances from bacteria before they can make you sick\ (2) stimulates your immune system against the pathogens (3) kills any pathogenic bacteria in your body (4) changes pathogenic...

which gland does not secrete a hormome? 1.pituatry gland 2.thyroid gland 3.sex gland 4.salivary gland is it 4