Humans have nearly 80 different kinds of organs. each organ serves a specialized
purpose in the body. for example, the brain serves as the control center of the body.
what do single-celled organisms have that serve the same purpose as organs?

o molecules

organelles

tissues

atoms

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.