When a wave has a height of 5 feet and a wavelength of 15 feet then it has a wave base of 7.5 feet. Wave base is equal to the half of the wavelength so if you consider your wavelength to be 15 feet then it is divided into 2 that would give you answer of 7.5 feet.
Start with the one that you know better the beginning of essays are hakf the tine awkward anyway.
They hide in places like driftwood and vegetation
I believe it would be Mitochondria