Fungi can reproduce both sexually and asexually.

A. Biosafety Level 1: BSL-1 is designated for microbes that pose minimal risk to humans and the environment. These organisms are non-pathogenic and can be safely handled with standard laboratory practices.

B. Biosafety Level 2: BSL-2 is used for organisms that pose moderate risk and may cause human disease, requiring additional precautions such as limited lab access and protective equipment.

C. Biosafety Level 3: BSL-3 applies to microbes that can cause serious or potentially lethal diseases via inhalation, requiring controlled access and specialized safety equipment.

D. Biosafety Level 4: BSL-4 is reserved for dangerous, exotic pathogens such as Ebola virus, which carry high risk of life-threatening disease and require maximum containment facilities.

A. cell culture: Viruses can be grown in cell cultures, where living host cells provide the machinery necessary for viral replication. This is a common laboratory method.

B. nutrient media: Viruses cannot grow on nutrient media alone because they require living host cells for replication. Nutrient media supports bacterial and fungal growth, not viruses.

C. lab animals: Some viruses require whole organisms for propagation, so laboratory animals can be used as hosts to study pathogenesis and replication.

D. embryonated eggs: Embryonated chicken eggs provide a supportive environment for viral growth and are widely used for vaccine production, such as influenza vaccines.