What poses a greater threat to the entire human species; poisonous abiotic factors or poisonous biotic factors? and why? can i get a detailed answer plz me. i'll love you forever

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form