According to the law of conservation of mass, which of these is true? a. when a physical change occurs, some of the mass is destroyed. b. when a chemical change occurs, some of the mass is destroyed. c. when both a physical and chemical change occurs, mass is added. d. when either a physical or chemical change occurs, no mass is destroyed. ( sorry don't know what subject for this since there isn't )

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.

the endomembrane system i think

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.

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.