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Tanzania [10]
3 years ago
8

Which of these describes the most widely held scientific theory on what catastrophic events led to the Cretaceous–Tertiary extin

ction about 65.5 million years ago, which eventually led to the extinction of dinosaurs?
Biology
1 answer:
9966 [12]3 years ago
4 0
That would be a meteors impact I believe.
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When does the nuptial flight occur in honey bees​
vlabodo [156]

Answer:

<em>When a queen gets old or weak and slows her production of queen substance, she is generally replaced by a new queen. New queens are also produced in colonies about to swarm. Virgin queen bees take what is known as a "nuptial flight" sometime within the first week or two after emerging from the pupal chamber.</em>

7 0
2 years ago
Asking a question for my Lil sis :)
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Answer: Deoxyribonucleic acid.

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A callus is a hardening of skin, which protein is very abundant here?
Pie

Answer:

A callus is a hardening of skin, keratin is the protein which is abundant in callus. Skin is a protective layer against a external environment. Outer layer of skin consist of keratin which is also found in hair. Callus is the accumulation of dead cells result due to friction and pressure exerts on the part in which they are present. The keratin component (keratinocytes) remains undifferentiated in these dead cells which causes hardening in callus.

6 0
2 years ago
Help me the test is tomorrow
Nadya [2.5K]
Hiiii I’m pretty sure the answer is a
5 0
3 years ago
Biology homework please help
ludmilkaskok [199]

Answer:

muscles

ribs

lungs

bronchioles

alveoli

diffuses

leaves

exchange

Explanation:

Your diaphragm, and <u>muscles</u> between your <u>ribs</u>, make air move in and out of your <u>lungs</u>. It travels through the trachea, bronchi, and <u>bronchioles </u>to <u>alveoli</u>. In the alveoli, oxygen <u>diffuses</u> into the blood and carbon dioxide<u> leaves</u>. This is gas <u>exchange</u>.

<em>Air enters the lungs and leaves it as a result of the relaxation and contraction of the diaphragm and the muscles between the ribs. When both the muscles and the diaphragm relax, air enters from the trachea and travels through the bronchi and the bronchioles to the alveoli, where the oxygen in the air diffuses into the blood and carbon dioxide diffuse in the opposite direction. The entire process is known as gas exchange.</em>

7 0
2 years ago
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