Which phenomenon causes the star to appear this way? O redshift
gravitational lensing
O principle of equivalence
O gravitational time dilation

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

neither accurate nor precise.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).