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kifflom [539]
3 years ago
14

What is the primary cause of respiratory distress syndrome (rds) of the newborn?

Biology
1 answer:
zhuklara [117]3 years ago
7 0
The disease is mainly caused by a lack of a slippery substance in the lungs called surfactant. This substance helps the lungs fill with air and keeps the air sacs from deflating. Surfactant is present when the lungs are fully developed.

https://medlineplus.gov/ency/article/001563.htm
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4 years ago
A phylogenetic tree shows that birds and crocodiles share many features. A hypothesis based on this tree predicts that these fea
Anastaziya [24]

Complete question: A phylogenetic tree shows that birds and crocodiles share many features. A hypothesis based on this tree predicts that these features are present in a common ancestor. Which of these predicted traits is supported by fossil evidence?

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Answer: (c) eggs and nests

Explanation:

A hypothesis based on phylogenetic tree shows that birds and crocodiles have ancestral connection. Fossil evidence shows that their common ancestor exhibit oviparity as a means of reproduction (i.e. laying of eggs and embryo develops within the egg), and also housed their eggs in the nest for protection against predators and other important reasons.

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What's a success you have had this week?
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What is distinguised between the two types of Earth's crusts?
Andreyy89
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Hope this helps!


Thanks,
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