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Alex777 [14]
3 years ago
7

1

Biology
1 answer:
shusha [124]3 years ago
7 0
B
Please Mark brainliest
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Provide a closed environment.

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Explanation:

Biosecurity  is a measure which is taken in order to protect or prevent the population of existing species from infestation of harmful organisms and chemical substances. The hatchery should provide a closed environment in order to prevent the entry of harmful organism. Cleaning of the chamber where eggs were hatched with chemicals in order reduce the infestation of microorganism.

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The dermis is thicker than the subcutaneous layer.hope that helps :)
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The answer is   B. fight disease

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The areas that have had the action potential are refractory to a new action potential.

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A keystone species helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
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