Describe how triangulation method is used to measure large distnaces, by taking suitable example.

Triangulation method is used for measuring very long distances.

What is parallax method? How is it used to measure large distances?

Name the method used to measure the distance between stars.

Two persons A and B are 40 m apart. Triangulation method was used to measure the distance obtained is place C and the person A. The triangle obtained is as shown. The triangle is drawn from the positions of A and B and the vertices P, Q and R correspond to the position of A, B and the palce C, respectively. Determine the distance between the person A and the place C.

Explain predator-prey relationship taking suitable example.

Illustrate use of safer solvent by giving suitable examples.