Which of the following are included in group 8a (sometimes referred to as group 18)? check all that apply. a. helium b. xenon c. potassium d. argon

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

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. which punnett square represents the correct way to set up the cross rryy  ´  rryy? 

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome