Two scientists are cutting samples of leaves for analysis. one scientist always clips a sample from the base of the leaf near the stem, and the other scientist always clips a sample from the tip of the leaf. what kind of error did the two scientist illustrate? a. procedural error b. calibration error c. measurement error d. unit error

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Can someone pretty me with this ? it’s urgent. compare the three theories of emotion. here are the three theories of emotion. cannon-bard theory of emotion: the belief that both psychological arousal and emotional experience are produced stimultaneously ( at the same time) by the same nerve stimulus. james-lange theory of emotion: the belief that emotional experience is a reaction to bodily events occurring as a result of an external situation. ( “ i feel sad because i am crying.) schachter-singer theory of emotion: the belief that emotions are jointly determined by a nonspecific kind of psychological (bodily function) arousal and its interpretation, based on environmental ( natural surroundings) cues. which of these theories makes most sense to you? why. your response should be written using proper english spelling and grammar. and it needs to be 10 complete sentences.

Adistinctive characteristic of mammals that is not observed in other vertebrates is