Punnett squares can help us predict the probability of certain traits being passed down family lines. Suppose your maternal grandparents had a phenotype of brown hair with genotypes of Bb and BB. Your paternal grandfather has brown hair (Bb,) and your paternal grandmother has blonde hair (bb.)

well we can't tell you because we cant see the time give a screen shot or something.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.