Which of the following statements best describes what the law of conservation of mass means? (2 points) ~When a state change happens, a substance becomes denser and its mass increases.

~When a solid melts into a liquid, its mass increases through the phase change.

~When a liquid evaporates into a gas, mass is lost through the phase change.

~When a substance changes from one state to another state, its mass does not change.

What is histamine and what is its role in allergic reactions

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell