8. What is a wave that has all the crests and troughs in the same place at the same time? 1:hologram 2: wavelength
3: coherent wave fiber
4: optic wave​

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.