The basic solar nebular disk model (SNDM), developed by Russian astronomer Victor Safronov, and was made available in English in the early 1970's. So your answer is B.<span />
Explanation: The prevailing model for planetary acceleration also known as the fractal assembly dating back to 18th century assumes that the solar system is made up of small grains striking each other chaotically into bigger ones, to form planetesimals.
Plastesimals then collide to form planets. This model was proposed by Russian astronomer Victor Safronov and it was further translated in English in 1970s by George Wetherill.
The new organism should be placed with the bird group based upon the homology obtained by the genomic data. This would imply a shared common ancestor. The trait shared with bats but not birds could be an analogous trait.
