Answer:
Enzymes are specialized proteins that soil microbes use to make nutrients available for microbial and plant uptake, by breaking down organic material into small enough molecules for plants to absorb through their cell wall
Explanation:
The correct answer is (a) driving.
The pressence of undesirable substances in air is called as air pollution. There are many human activities that contribute to air pollution. The biggest contributor is driving. The pollutants that comes out of the car are carbon dioxide, carbon monoxide. They also release hydrocarbon and nitrogen oxides which when combines in sunlight becomes ozone. Air pollutants emitted by cars and other automobiles increases the level of harmful gases which to severe health problems such as heart disease, asthma, irritation in eyes.
It could be the cell membrane which is a barrier, thinner than the cell wall, that protects the cell and controls transport from within and outside the cell.
