A. According to modern ideas, the first step in the origin of life was
volcanic activity
b. the formation of simple organic molecules
the
presence of
oxygen in Earth's environment
d. the evolution of autotrophic prokaryotes
C. the presence of oxygen in earths environment
D. the evolution of autotrophic prokaryotes

Types of scientific inquiry that biologist engage in that cannot be completely controlled

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.

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart