Density dependent factors are the one that affect the birth and death rates of population in a density dependent manner. On the other hand, density independent factors limit the population size irrespective of the size of the population. Among the given options, volcanic eruption is a density-independent factor limiting population growth.
During the dissection study the body is kept in laying position so that the scientist can easily perform experiments. The body is kept in laying position not in upward position. The body in upward position will have gravitational effect on the fluids and the body layer will not melt.
