The correct answer is option D.
If a girl is standing in front of a smooth surface from which a sound is reflected, the girl may hear two similar sets of sounds if she is also near the source of the sound.
For proper reflection of all sorts of energy waves, a hard flat surface is preferable. This helps to reflect waves without losing energy. Hard and smooth surfaces are best for travelling of sound waves because sound is related to pressure.
Answer:
1. Wrinkle-resistant. Wool springs back quickly after stretching.
2. Resists soiling. Fiber forms a complex matting.
3. Retains its shape. Resilient fibers return to original size after washing.
types:
1. Lambswool
2. Merino
3. Cashmere
I think I am right well hope it helps:):):)............
Same: It works as a hinge because it moves and attaches it
Diff: idk sorry :/
Two diseases caused my defective cells is HIV (human immunodeficiency virus) and AIDS (acquired immunodeficiency syndrome).
Only breed the ones that are pure white. Selective breeding can be negative because it can cause mutations in the organism