Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable? by repeating trials during an experiment by keeping the results private by recording values without units by making a single observation

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

thats not a question