What is a soil horizon?
question 13 options:
soil that is still mostly rock material
bare soil from which all vegetation has been removed
a layer of soil with characteristic properties
a pictorial view of soil showing its ecosystem
how did the everglades wetlands become drier?
question 14 options:
dam and canal building diverted the historical flow of water away from the everglades.
dam and canal building forced water into underground aquifers to expose wetlands.
more water was used to irrigate out-of-state farms than could be replenished by rainfall.
climate change caused water in the everglades to evaporate.

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

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above