What factor key is a component of health

The nutrient facts label on a food package lists the following: iron 50%. what does this figure indicate?

Avirus consisting of a single strand of rna, which is transcribed into complementary dna, is a ) proteaseb) retrovirusc) rna replicase virusd) nonenveloped virus

Waste is deposited into in thin layers which are then compacted and covered with soil.