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saul85 [17]
3 years ago
13

Which structure is directly involved in gas exchange?

Biology
2 answers:
g100num [7]3 years ago
8 0
Trachea i believe is the answer
diamong [38]3 years ago
6 0

Answer:

Trachea i believe it is the answer

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Which four systems describe fuctions of the circulatory stystems.?
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The four systems that describe the functions of the circulatory systems are:

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What is the circulatory system?

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3 0
2 years ago
What would happen to the environment if all the nitrogen fixing bacteria died??
Evgesh-ka [11]
trees do not fix N2 from air they fix oxygen with the help of N2 fixing bacteria . so trees do not fix N2
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3. How many membranes does the<br> nucleus have?
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Answer:

2 membrans

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3 0
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