Given that,
The speed of a wave, v = 200 m/s
Wavelength, 
We need to find the frequency of this wave. The relation between wavelength, frequency and the speed is given by :

So, the frequency of this wave is 100 Hz.
The number of the chromosomes in each of its body cells from the number of chromosomes of its gametes would be 9. It is because the number of chromosomes in a gamete must be halved in order to achieve the number of chromosomes present in each body cell which is important for cell division.
A. It fluctuates with the seasons
Mitochondria - Mitochondria are oblong shaped organelles.