Answer:
B. The spinning motion of Earth.
 
        
                    
             
        
        
        
Sedimentary because it is made of layers of sediment and fossils can easily get mixed in
        
                    
             
        
        
        
Correct answer: C). Cells are the basic building blocks of life but do not constitute life itself
 Cell theory in a biology is a scientific theory, which is universally accepted and it states that all living organism are made up of one or more cells, cell is the building block of living thing, it also states that all cell arise from ore existing cells.
The cell theory is collection of ideas and conclusion, which were given after many years of continuous research and experiment of many scientist, which tells about the cell and how it operates.
 
        
                    
             
        
        
        
Answer: 0.04metres
Explanation:
The wavelength of a wave is the distance covered by the wave after one complete cycle. It is measured in metres, and represented by the symbol λ
Recall that Velocity (V) = Frequency F x wavelength λ
V = F λ
Make λ the subject formula 
λ = V / F
In this case Frequency = 0.4 kHz 
Convert kilohertz to hertz by multiplying 0.4 by 1000 i.e (0.4 x 1000Hz) = 400Hz
Velocity of wave = 16 m/s
So, λ = V / F
λ = 16 m/s / 400Hz
λ = 0.04metres
Thus, the wavelength of a wave is 0.04metres