? also known as "whalebone," is a tough keratinous substance from the mouths of filter-feeding whales. In texture, it is comparable to modern plastics, and has long been used by Native Arctic peoples to make buckets, cups, and other containers, ice scoops, sled runners, fish line, lashing, and nets.
O a. Spruce root
O b. Baleen
O c. Argillite
O d. Sinew

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The term collage was coined by both  georges braque  and  pablo picasso  in the beginning of the 20th century when collage became a distinctive part of modern art.hope this sorry if there wasn't more of an explanation!

The correct answer is a.the castrati were classical singers with very high voice equivalent to that of a soprano, mezzo-soprano or contralto. this effect of high voice was produced by castration before puberty or an endocrinological condition. the castrati first started signing at the church but then they also sang at the opera. they did not only sang in italy but in many churches in europe. finally, they were singing male and female roles as well.