. A positive food test produces an orange precipitate. Which test was performed? A Amino acids were mixed with cold biuret solution. B Glucose was heated with benedict's solution C Protein was heated with benedict's solution D Protein was mixed with biuret solution and heated.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

answer; cnidarians;