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vaieri [72.5K]
3 years ago
7

When you examine the bones the in your arm, you are looking at a structure that first appeared in?

Biology
1 answer:
d1i1m1o1n [39]3 years ago
6 0
The bones in your arm are a structure that first appeared in lobe fin fishes, such as the Eusthenopteron fish.
let me know if you have any other questions
:)
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Answer:

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Explanation:

Mass of the isotope present at initial stage = N_o=200 g

The mass of the parent isotope left after the time ,t=N

Time taken by the samle ,t = t_{\frac{1}{2}}

The half life of the sample :t_{\frac{1}{2}}

N=N_o\times e^{-\lambda t}

\lambda =\frac{0.693}{t_{\frac{1}{2}}}

\ln[N]=ln[N^o]-\frac{0.693}{t_{\frac{1}{2}}}\times t_{\frac{1}{2}}

2=\frac{[N_o]}{[N]}

[N]=\frac{N_o}{2}=\frac{200 g}{2}=100 g

100 grams of the parent isotope will remain after one half life.

5 0
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Oduvanchick [21]

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Some of the pioneer species are lichens and algae. Pioneer species like lichens help in the formation of soil from breakdown or rocks which allow the formation of a suitable environment for the ecological succession of other species like mosses, algae, and other small plants. Therefore the statement is true.

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