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natulia [17]
3 years ago
10

Body size is a heritable trait in the amphipod, and aquatic crustacean. fish preferentially consume large amphipods, leaving pri

marily small amphipods to breed. based on these observations, how would we expect evolution to affect ponds with and without fish?
Biology
1 answer:
aleksley [76]3 years ago
6 0

Since fish feeds primarily on large amphipod, therefore what we expect to remain to evolve on ponds containing fish would be smaller amphipod or crustacean. Then correct answer to this question would be:

<span>“Ponds with fish should have smaller amphipods.”</span>

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Answer: the cfu/g Gram-negative bacteria in the fecal sample is C = 3.0 × 10^3

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We know that; Gram negative bacteria looks  pale reddish in color under a light microscope from Gram staining.

therefore

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1 mL of from tube 1 was removed and added to tube with 99 mL saline (tube 2) dilution is 1/100.

transferred volume  into the plate is 1 mL.

Now, we have to determine the cfu/g Gram-negative bacteria in the fecal sample

Formula to calculate CFU/g bacteria in fecal sample is expressed as;

C = n/(s×d )

where C is concentration (CFU/g) , n is number of colonies , s is volume transferred to plate , d is dilution factor.

so we substitute

C = 30 / ((1/100) × 1)

C = 30 / 0.01

C = 3000

C = 3.0 × 10^3

THERFERE, the cfu/g Gram-negative bacteria in the fecal sample is C = 3.0 × 10^3

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