Biology HW: theories of the origin of life on Earth

Directions:  Be sure to make an electronic copy of your answer before submitting it to Ashworth University for grading.  Unless otherwise stated, answer in complete sentences, and be sure to use correct English spelling and grammar.  Sources must be cited in APA format.  Your response should be one (1) single-spaced page in length; refer to the "Assignment Format" page for specific format requirements.

There statement concerning what scientists believe about the origin of life on earth.  Summarize the three (3) current competing theories of the origin of life on Earth: it arrived from an extraterrestrial source, it originated as a heterotroph, it originated as an autotroph.