What types of rocks were used to construct the time scale?

Christie's doctor recommends that she eat 40 grams of protein a day. she's already consumed 50% of her protein recommendation for the day. how many servings of the given snack should christie have to meet her daily protein recommendation?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

What factors contribute to the effect an environmental toxin has on the human body?