The parallax method of measuring star distances gives most accurate results when the gap between two observations of a star is about six months. which of these statements best explains why a gap between observations affects the accuracy of the star distance? a. it allows the star to complete its life cycle and evolve from one form to another. b. it ensures that measurements are taken from two points which are very far apart. c. it makes up for the changes in the star's position due to its movement around the sun. d. it to take the measurement of changes in the position of the star due to supernova explosions.

b). It ensures that measurements are taken from two points which are very far apart.

Explanation:

In parallax method of measurement of the distance of far or distant objects we know that we use the method of distance geometry

It is given as

now we have

Arc = distance between two positions from which angle is measured

Angle = total angle subtends by the planet at two positions

radius = distance of the planet

so we will have

so here if we ensure large arc length then the error in the measurement of the angle will be small and the distance will be accurate.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

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