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-BARSIC- [3]
3 years ago
6

HELP I AM IN AN EXAM AND I NEED HELP PLEASE I WILL MAKE BRAINLIEST!!!The picture shows two different species of mammals that use

wings to glide among tree tops. However, scientists theorize that these mammals are not closely related.
Which best explains why these two animals look so similar if they are not closely related?

They have analogous structures that developed for different functions.
They have homologous structures that developed for different functions.
They live in similar environments and have analogous structures adapted to them.
They live in similar environments and have homologous structures adapted to them.
Chemistry
2 answers:
SIZIF [17.4K]3 years ago
8 0

Answer:They live in similar environments and have analogous structures adapted to them.

Explanation: Analogous mean comparable in certain respects, typically in a way which makes clearer the nature of the things compared. So if they are not releatd then they are connected to there shared environment.

Natalka [10]3 years ago
8 0

Answer:

They live in similar environments and have analogous structures adapted to them.

Explanation: TOOK THE TEST

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Antimony has two naturally occuring isotopes, 121 Sb and 123 Sb . 121 Sb has an atomic mass of 120.9038 u , and 123 Sb has an at
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Percentage abundance of 121 Sb is = 57.2 %

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The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

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Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope, 121 Sb :

% = x %

Mass = 120.9038 u

For second isotope, 123 Sb:

% = 100  - x  

Mass = 122.9042 u

Given, Average Mass = 121.7601 u

Thus,  

121.7601=\frac{x}{100}\times 120.9038+\frac{100-x}{100}\times 122.9042

120.9038x+122.9042\left(100-x\right)=12176.01

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x = 57.2 %

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