What is the First Law of Thermodynamics?

Which of the following is true about Agenda 21? 

In a food chain or food web, decomposers will feed on

The chemical formula for sulfur dioxide is SO2.  This means there is/are __ sulfur atoms and __ oxygen atoms in this compound.

An example of sympatric speciation would be the separation of two kinds of birds by their food preferences, because this is ____ isolation that could lead to the formation of two different species of the birds.

If a harmless frog has the same coloration as a toxic frog this is an example of 

Bees, wasps and other stinging insects often have the same yellow and black coloration. This is an example of 

Poverty, population growth and desertification and drought are three of the 10 key factors of Agenda 21 as listed in your text. List two more of these 10 key factors.

What is the trophic level of an herbivore such as a cow that eats only grass? 

What is the major source of nitrogen in the nitrogen biogeochemical cycle?