The pharmacy technician should avoid spraying any substances into the when cleaning the laminar airflow hood.

The right answer is HEPA filter.

A HEPA filter (High Efficiency on Particles Air) can filter up to 99.97% of 0.3μ aerial particles.

These filters are used to clean the air and retain suspended particles (dust, pollen, bacteria etc.) and other particles that can cause respiratory allergy in sensitive subjects.

They are very used in sterile rooms

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.