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Gelneren [198K]
3 years ago
10

When did the mass extinction occur? (Name the era and period)

Biology
1 answer:
kherson [118]3 years ago
6 0

Answer:

Explanation:

The first mass extinction is called the Ordovician-Silurian Extinction. It occurred about 440 million years ago, at the end of the period that paleontologists and geologists call the Ordovician, and followed by the start of the Silurian period. In this extinction event, many small organisms of the sea became extinct.

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How are red blood cells able to move through narrow vessels to carry oxygen throughout a multicellular organism? (1 point) a)The
geniusboy [140]

Answer:

The correct answer is - option B. They are small because they lack a nucleus.

Explanation:

Red blood cells or erythrocytes are specialized cell that produce in bone marrow and have specific role such as carrying oxygen from lungs to deliver it to the various organs and carry out carbon dioxide.

In mammals these cells lack cell organelles such as nucleus and mitochondria, a major factor that determined its smaller size. The size of RBC are move through narrow vessels throughout a organism because of its specific size and shape that provide it space for hemoglobin and allow to be flexible and bend to move through narrow vessels.

Thus, the correct answer is : option B. They are small because they lack a nucleus.

8 0
3 years ago
The digestive, circulatory, respiratory, immune, and excretory systems all work together to maintain homeostasis. Discuss how a
Alisiya [41]
Ur digestive system is responsible for breaking down food substances to provide ur body with the nutrients it needs. circulatory system take blood to all parts of ur body.
respiratory system gets oxygen in n carbon dioxide out..your immune keeps you healthy by fighting off infections. and ur excretory system takes out waste fluids out ur body.
you should be breathing, oxygen goes into ur lungs, your blood gets some of that oxygen n Carries it through ur body to keep it working.. now ur body is working, ur digestive system is breaking down food n sending the nutrients into ur blood stream n taking waste materials out n so is ur excretory system.. your immune system is also healthy good because there is no waste substance stuck in ur body thanks to ur excretory system n ur digestive system..now to u see how they r AL connected?..if one fails to do what it's supposed to o, it would affect the other systems...let's say ur respitory system malfunctions...u get no oxygen going in you blood stream which is dangerous because ur circulatory system needs it..or if ur digestive system fails to do its job, u won't be getting the nutrients you need to go in the blood stream n flourish the body, it would affect your immune system..if ur circulatory system doesn't work like it's supposed to be, it would be a bad situation because ur blood could cloth if it stays in a place for too long without moving n u could get a stroke ..blodclothing could stop the flow of blood from going to a location n taking nutrients from the digestive system n oxygen from the respiratory system to that part of ur body n it would feel numb or tingly..n if ur excretory fails, waste substances are traped in ur body which is poisonous n can go into ur bloood stream n affect your immune system..



sorry, this is all in my own words n I wrote a lot..
6 0
3 years ago
Which cell structure serves the stated function in both eukaryotic and prokaryotic cells?
velikii [3]

Answer: O cytoplasm: protects cell structures

Explanation:

4 0
2 years ago
What is one way that the surrounding ecosystem can affect the glacier mouse ecosystem?
pshichka [43]

Answer:

Hope this helps!!

Explanation:

Glaciers act as reservoirs of water that persist through summer. Continual melt from glaciers contributes water to the ecosystem throughout dry months, creating perennial stream habitat and a water source for plants and animals. The cold runoff from glaciers also affects downstream water temperatures.

7 0
2 years ago
Help please bc I don't really know so yea
iren2701 [21]
I'd say D cause ice is kinda more likely to do the job
5 0
3 years ago
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