How many moles of helium are in 16 grams of the element

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.