Organisms that use bulk flow to move oxygen are able to:

Biology

1 answer:

Pavel [41]3 years ago

7 0

B. achieve larger size than organisms that only use diffusion.

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2 years ago

The concentration of pathogen needed to kill 50% of an infected group of test animals is the __________.

natulia [17]

Answer:

LD50 (median lethal dose)

Explanation:

Whenever one needs to quantify the virulence of a pathogen then this is done by using a set of laboratory animals.
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LD50 is defined as the number of pathogens that are required to kill 50% of the total infected animals.
For the calculation of LD50, the animals are infected with a known number of pathogens and then a graph is plotted for the percentage of animals killed against the concentration of the pathogen used for infection. The point at which the graph indicates the death of 50% animals, the corresponding concentration of inoculation of a pathogen is taken as the LD50 of that particular pathogen.