I think it’s A, because all of these are related to fossil fuel somehow.
Answer:
i think its d i may be wrong
Explanation:
Answer:
Frequency, f = 0.6 Hz
Explanation:
We have,
Number of waves passing through a point are 3
Time for which the waves are passing is 5 seconds
It is required to find the frequency of a wave. The frequency of a wave is defined as the no of waves per unit time. So,

So, the frequency of a wave is 0.6 Hz.
sometimes I think of plss, and it reminds me of you *bites lip*
Good ventilation as a product of it is pure Cl2 gas