1. What are the six key elements in living organisms, and where does each occurin the atmosphere, hydrosphere, or lithosphere? Nitrogen, carbon, oxygen, hydrogen, phosphorus, and sulfur are the key elements in
1. What are the lessons to be learned from the Aral Sea story? The diversion of water can be an environmental and economic disaster. Doing something without thinking through the consequences can be disastrous. The fishing industry dependent upon the
1. What are the two fundamental kinds of population growth curves? What are the causes and consequences of each? The two types of population growth curves are the J-curve and the S-curve. The J-curve demonstrates popul
1. How has the global human population changed from early times to 1800? From 1800 until the present? What is projected over the next 50 years? From the dawn of human history until the beginning of the 1800s, pop
What is the difference between the biotic community and the abiotic environmental
factors of an ecosystem?
The biotic community is the living portion of the ecosystem—plants,
animals and microbes—while the abiotic community is the non-living portion—