Question

13. प्रायोगिक अभिलेख पुरितका एवं मौखिकी।।
Practical record book and viva-voce.​

Answer 1

Explanation:

Shadows are formed when the light gets obstructed by an opaque object. ... When the bird is flying high in the sky the distance between the body and the surface of the Earth is too large and hence even though the light is obstructed by the bird's body it cannot cast its shadow due to the large distance.

Answer 2

Explanation:

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.