How old is a bone in which the carbon-14 in it has undergone 3 half-lives? a) 11,400 years old eliminate b) 17,100 years old c) 34,200 years old d) 57,000 years old

The answer is B 17,100,

(1,250 is the third half life of carbon 14)

Explanation:

The carbon 14 remaining in 0 years is 10,000. The carbon 14 remaining after its first half life would be 5,000, which is 5,700 years after death, the second half live would be 2,500 which is 11,400 years after death, the third half life is 1,250 which is 17,100 years after death. (divide the full life 10,000 by two)

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a. Trees regain their leaves.

In winters the trees looses their leaves because of limited availability of sunlight in cooler temperature, they also block the supply of water to the leaves and seals off the region between the leaf stem and tree trunk. Trees regain their leaves in springs. The deciduous trees produces thin, broad and light- weighted leaves. This type of leaf structure is capable of capturing sunlight efficiently.