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
Because water makes everything flow to the digestive track
Because all living things are made of carbon in one way or another and we use nitrogen and water naturally.
Answer:
B. to have new plants that grow far away from parent plants so that they dont compete for resources
Explanation: