1.carbon 2oxygen 3.nitrogen is an element found in all organic molecules. during respiration, animals excrete it as a gas known as . 1 nh4 2 o2 3. co2

1st=Carbon

2nd=CO2

Hope it's right!

1. Carbon

2. CO2

Explanation:

1. All living things are made of inorganic molecules mainly carbon and hydrogen. These two elements form the backbone of hydrocarbons which are considered as the building block of living things

2.During respiration in living beings (animals and human beings), the oxidation of carbohydrates takes place  in which glucose is break down into carbon dioxide and water.  

1. the energy lost to disorder metabolism     -entropy

2. related to or possessing motion potential     -kinetic

3. all of the chemical reactions in an organism required for maintenance of the processes of life entropy     -metabolism

4. possible; ability to go into action or perform work kinetic     -potential

5. the study of energy and its transformations thermodynamics     -thermodynamics

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: