Final answer:
The number one concern for the growth of bacteria is b)Oxygen.
Step-by-step explanation:
The number one concern for the growth of bacteria is b)Oxygen.
Bacteria can be classified into different categories based on their requirement for oxygen in the atmosphere. Obligate aerobes require an abundant supply of oxygen for growth, obligate anaerobes are killed by oxygen, facultative anaerobes can grow in the presence or absence of oxygen, and aerotolerant anaerobes are indifferent to the presence of oxygen. Some bacteria, known as microaerophiles, require a minimum level of oxygen for growth.