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love history [14]
4 years ago
5

Blimps were once filled with hydrogen, but now helium is used

Biology
1 answer:
rusak2 [61]4 years ago
6 0

Answer:

C.

Explanation:

Hydrogen's pure form is gas at room temperature. Helium is expensive. Hydrogen is lighter than helium.

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Crickets "chirp" by rubbing their wings or legs over each other. This phenomenon is known as stridulation. It is a means by whic
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b. As the humidity rises, the cricket chirp frequency occurs more rapidly therefore increasing. It is incorrect. The increase in humidity does not affect the chirp frequency in crickets.

Explanation:

As temperature increases, the frequency of cricket chirp increases too. After listening to the audios, we can see that in the first audio, where the temperature is 14° Celcius, the frequency is 24 chirps in 15 seconds. In the second audio, with 19° Celcius, the frequency is 28 chirps in 15 seconds. In the last audio, where the temperature is 24° Celcius, the chirp's frequency is 34 chirps in 15 seconds. In conclusion, if the temperature increases, the chirps' frequency increases too.

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