They are ineffective against viral infections because viruses can not be treated with antibiotics.
The answer would be letter a
Secondary succession occurs after the initial succession has been disrupted and some plants and animals still exist. The disruption occurs afer an event like a forrest fire or hurricane destroys the forest.
Enzymes are considered catalysts, they help reactants and can be used over and over
An independent variable is the one that you change and the dependent variable that changes when he independent variable changes.
