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Luden [163]
3 years ago
14

Biology help??? Anyone know these questions??

Biology
2 answers:
Rama09 [41]3 years ago
7 0

The ozone later; chlorofluorocarbons

poizon [28]3 years ago
7 0

6. Answer C?


8. Answer C


9. Answer A

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An aquifer is an underground layer of rock or sediment that holds water. 2 years ago _____ had a shortage of water in its' aquif
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Answer:

d

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because the government and people

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3 years ago
How does fertilization occur?
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What refrigerant safety group classification has the highest flammability and the highest toxicity?
timama [110]

Answer;

-B3

Explanation;

Refrigerants are divided into two groups according to toxicity:

-Class A signifies refrigerants for which toxicity has not been identified at concentrations less than or  equal to 400 ppm;  and

-Class B signifies refrigerants for which there is evidence of toxicity at concentrations below 400 ppm.

They are also divided into three groups according to flammability:

-Class 1 indicates refrigerants that do not show flame propagation when tested in air at 21°C and 101  kPa;

-Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3  at 21°C and  101 kPa and a heat of combustion of less than 19 kJ/kg;

-Class 3 indicates refrigerants that are highly flammable as defined by a lower flammability limit of less  than or equal to 0.10 kg/m3  at 21°C and 101 kPa or a heat of combustion greater than or equal to 19  kJ/kg.

-Therefore; the answer for the above question would be Class B and class 3.

3 0
3 years ago
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Many closely related species of ducks have different courtship dances that are performed to solidify a pair-bond. If you were to
damaskus [11]

Answer:

I would expect to see a new phenotype in which the new duck hybrid species would express a new mixed courtship dance with the behaviors of both parentals.  

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The cross between both parentals, each from different species, might produce a new phenotype that exhibits both parental dances. The new dance might be considered a hybrid of the parental dances.

Genetically speaking, we can think that there is a gene codifying for the courtship behavior in one species and another gene expressing a different courtship behavior in the other species. This cross´ product would be a hybrid species that exhibits a part of both parentals´ behaviors.

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2 years ago
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A transportation method.

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