The structures marked 3 in the diagram are responsible for

Why are lipids and proteins free to move laterally in membranes?

Put each tile to the correct location. categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. 1) scientific theories 2) both 3) scientific hypothesis a). a tentative statement used to guide scientific investigations b). makes predictions about future events c). can be tested many independent researches d). based on observations of natural phenomena e) . a well-established highly reliable explanation

How do light years astronomers to determine the ages of distant objects in space ?