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tia_tia [17]
3 years ago
8

Most insects have small holes in the exoskeleton called _____, which open and close to regulate air flow.

Biology
2 answers:
skelet666 [1.2K]3 years ago
7 0
Spiracles is the correct answer
Anestetic [448]3 years ago
3 0

Answer: The correct answer is Spiracles

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Progressive Muscle Relaxation

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The evolution of the heart is based on the separation of oxygenated blood from deoxygenated blood for efficient oxygen transport. pisces have a dual chambered heartwhile reptiles and amphibians are having a three chambered finally aves and mammals have four chambered hearts.

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B

Explanation:

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What is the primary role of the respiratory system in living organisms?
Anestetic [448]
To obtain oxygen.............
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A note to Charles Darwin about his findings
mafiozo [28]

Answer:

Dear Charles Darwin,

My name is ___ and I was wondering how all of your theories and findings came to your comprehension of evolution. I have heard and learned about your evolution theories and would like if you could answer some of my questions. What first sparked the interest in evolution? Do you truly believe that everything evolves over time? How do your findings contribute to your theories of evolution? Thank you for your time to answer these questions.

Sincerely ___

Explanation:

Charles Robert Darwin was a British naturalist, geologist, and biologist best known for his contributions to evolutionary science. His dissertation that all kinds of life are derived from a common ancestor is widely accepted today and is considered a basic concept of science.

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