What structure controls the passage of substances into and out of a cell?

Llama have 74 chromosomes how many chromosomes will they be found in their gametes explain how you know

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?