Regarding studies with infectious agents in animals, as the bsl and absl number increases from 1 to 4, what happens to the containment and safeguard practices?

Work in BSL-4 containment laboratory requires time and great attention. The same work that is done in a BSL-2 laboratory will take significantly longer in a BSL-4 setting. This increased time requirement is due to a lot of factors that are aimed at protecting the worker from laboratory-acquired infections. The BSL 4 laboratory should contain a Class III biological safety cabinet but may use a Class I or II BSC in combination with a positive-pressure, air-supplied full-body suit. Usually, BSL 4 laboratories are in separate buildings. Exhaust streams are filtered through high-efficiency particulate air (HEPA) filters, depending on the agents used.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

im not in connections yet but i might can you some questions. what grade are you in?