Answer:External respiration occurs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the alveolar air. Internal respiration occurs in the metabolizing tissues, where oxygen diffuses out of the blood and carbon dioxide diffuses out of the cells.
Explanation:
Answer:
Plants are called Producers because they can produce food energy. Animals are called Consumers because they can only consume food energy. Animals that eat plants are called Herbivores or Primary Consumers. Animals that eat other animals are called Carnivores.
Explanation:
first, third, fourth, second
Enzymes are regulated by more than the binding of small molecules. A second method that is used all the time by eucaryotic cells to regulate a protein's function is the covalent addition of a phosphate group to one of its amino acid side chains. These phosphorylation events can affect the protein in two important ways.
