Which is not true of gene expression? 1. It creates different DNA within each of your cells.

2. It determines how a cell functions.

3. It occurs because of chemical signals within your body.

4. It is the process that turns certain genes on or off inside of cells.
ertain

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

i wish i could with all of them i can barley see the first one so here's the answer to the first one b