How long does the light from the sun reached here in Earth

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?