Is the experience of losing a loved one and is the emotional reaction to the loss.
grief; bereavement
bereavement; grief
widowing; distress
bereavement; solitude

grief , bereavement

b/c the definition of grief is the experience of losing a loved one

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms