Will give 60
a student 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?
the shift in light traveling from star to earth in winter
the shift in light traveling from star to earth in summer
the distance of the star from sun using parallax method
the distance of the star from earth using parallax method

the answer for this question is the distance of the star from sun using parallax method

The correct answer will be option the distance of the star from Sun using parallax method.

Explanation:

Parallax method or trigonometric parallax is a method of measuring the distance of nearby stars in space on the basis of displacement of stars against the background.

Since a student observes the position of the star in summer and then after 6 months in winter, star changes its position or displaces which can be measured by the student along with measuring parallax angle and drawing a baseline from the Sun as Earth revolves in orbit around the Sun. So by using the parallax method and the formula he can easily determine the distance from the Sun.

Thus, the distance of the star from Sun using the parallax method is the correct answer.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.