Why do red blood cells appear smaller after being exposed to a hypertonic starch solution?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Me the formula cacl2 represents the compound

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.