<span>A mutually dependent relationship exists between chloroplast and mitochondria in the plant cell. Photosynthesis, which occur in the chloroplasts,generates the sugar and oxygen gas that are used in mitochondria for cellular respiration. It generates carbon-dioxide which in turn is used as a carbon source for the synthesis of sugars during photosynthesis.</span>
It is answer A, the hippo is not benefitting from the catfish, therefore it is not mutualism.
I think the answer is D. ( or supported by observations ). Because theories change over time, they both NEED to be proven, they do NOT go off of consensus, but they do NEED to be supported by observations.
I hope this helps.
Answer
Your lower intestine of your body
