D. Red Blood Cells are not part of immune system
Countries with highest populations do not have the highest population densities. i.e statement is False
<h3>Population density </h3>
Population density is the ratio of the average population of an area to the per unit area ( i.e population of a country / land area of the country ). Some countries have a very high population but with a same land area, while certain countries have both high population and high land area.
Therefore we can not conclusively say that countries with highest populations in the world have the highest population densities.
Hence we can conclude that the statement in the question is false.
Learn more about population density : brainly.com/question/13902749
many things can lead to an algal bloom in a body of water.
I think the main one you should investigate is the process of eutrophication.