4) use each of the terms below to complete the passage.
cross-bedding fossils graded bedding
ripple marks sand dunes transport
lithification
bedding
the primary feature of sedimentary rocks is (a)
or horizontal layering.
the type of bedding that occurs depends upon the sediment's method of (b)
_ bedding is called (c)
when the heaviest and
coarsest material is on the bottom. a second type of bedding called (d)
forms as inclined layers of sediment migrate forward across a horizontal surface. large-scale
cross-bedding can be formed by migrating (e)
. when sediment is moved
into small ridges by wind or wave action, (f)_
can form. many sedimentary
rocks contain (g)
, the preserved remains, impressions, or any other
evidence of once-living organisms. during (h).
_ parts of an organism can
be replaced by minerals and turned into rock.

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

Warmer ocean surface water would most likely be found near