Which of these is most likely to reduce air quality, which could result in breathing problems ?

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

Which layer will become saturated first when rain falls?