I would say 1 and 4 are the best answers. GMO crops are clones (genetically identical) so it reduces the genetic diversity making crops susceptible to new diseases.
I believe it is important because you can find a way to cure diseases
A they remove it from the air
A circuit is the path that an electric current travels on, and a simple circuit contains three components necessary to have a functioning electric circuit, namely, a source of voltage, a conductive path, and a resistor.
This is because your taste and nasal receptors, which are located in the head, are blocked by mucus secreted by your cells. When blocked by mucus, these receptors cannot absorb the smells from foods and thus the taste is different or no as it is usually remembered as.