What suggests that these new populations are not an expansion of the lionfish’s natural range?
a. lionfish are native to the tropical pacific. there are no natural water routes of warm water between the pacific and atlantic oceans.
b. lionfish are native to cold waters near the tip of south america. they could not survive in the warmer waters between their native areas and the colder waters of the east coast of the united states.
so, it is very unlikely that these south american populations naturally spread north.
c. lionfish are not good swimmers and have no other mechanisms to spread their populations over great distances.
d. lionfish eat only a few specific types of algae that live in isolated regions of the pacific.
d. if lionfish spread much beyond their native pacific home, they would have nothing to eat.

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

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

Environmental differences within ecosystems are generally caused by