Answer:
Carbon
Hydrogen
Oxygen
Nitrogen
Explanation:
The key elements of an amino acid are carbon (C), hydrogen (H), oxygen (O), and nitrogen (N), although other elements are found in the side chains of certain amino acids. However, carbohydrates do not contain the element Nitrogen and all carbohydrates, including sugar, therefore contain the same three elements: carbon, hydrogen and oxygen. Different arrangements of these elements form single units to make different types of carbohydrates.
Precipitation is a water cycle process that happens when tiny droplets of liquid falls from the atmosphere it was settling. The hydrogen and oxygen mix back together and forms the water droplet altogether as it falls. The water cycle involves other process from evaporation, condensation and precipitation.
Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found. Therefore the answer is the air quality is good because of no lichens present
Answer:
B. The animals at each level use energy, so only a small amount of their energy is available to the next level.
Explanation: