To provide an accurate answer, I would need to see the content of Figure 1 that shows the embryo development for the four organisms (chickens, tortoises, rabbits, and fish). However, based on general knowledge of vertebrate embryology and evolutionary relationships, I can provide some insights into the statements.
A) Chickens and tortoises both belong to the clade of reptiles (birds are considered a subgroup of reptiles), while rabbits are mammals. Therefore, this statement cannot be supported as true.
B) This statement is generally incorrect, as these organisms do not share the same degree of evolutionary relationships, with fish being a more distant relative than the others.
C) This is also incorrect because fish do share a common ancestor with other vertebrates, as they are all part of the vertebrate lineage.
D) Based on typical embryological development patterns, fish (as a more basal vertebrate) are generally considered to be less closely related to birds (chickens) than birds are to mammals (like rabbits).
Given this, without seeing the figure, the most likely correct answer based on common evolutionary biology would be:
D: Fish and chickens are the least closely related.
Please cross-reference this conclusion with the information provided in Figure 1 for confirmation.