1. laura uses a cotton swab to collect microorganisms from a hand rail and streaks a plate. on the fourth day of incubation, she does not observe visible microbial growth. given that microorganisms are literally everywhere, give at least three reasons why laura may not have observed microbial growth?

Which list shows the levels of organization of an organism in hierarchical order from left to right, from the smallest to the most complex?

Before the can be observed by using a transmission electron microscope, cells are sliced into very thin sections. what disadvantage does this procedure present in the study of cellular parts

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h, o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.