Substance A is water and Substance B is chlorophyll
There are 15 different bird species present in a density of at least one pair per 20 acres at the same time that small trees are the dominant plant category.
<h3>What is population density?</h3>
The term population density refers to the number of organisms that are found in a place per unit area covered by the population. This includes both plants and animals.
There are 15 different bird species present in a density of at least one pair per 20 acres at the same time that small trees are the dominant plant category.
Learn more about population density: brainly.com/question/16894337