Bauplan is the assembly of the body structure which is common in the organisms belonging to the same phylum. The Same bauplan determines that a body part of the organisms are same and they will be in the same phylum in the Evolution also. Bauplan includes symmetry, segmentation, and limb disposition.
"How do the atmospheric conditions near the beginning of the Precambrian time contrast with the atmospheric conditions that are present now? Which organism is largely responsible for this change?"
Suggestion: maybe Alexa, Google, etc...
It would be D because it it based off of knowledge and you are proposing a hypothesis before conducting an experiment to predict what will happen
They turn brown because they begin to decompose..which is why bananas are biodegradeble because they are able to become decomposed by other living things
