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Anika [276]
4 years ago
9

In how many ways can 5 different trees be planted in a circle?

Biology
1 answer:
Julli [10]4 years ago
7 0
The number of arrangements of n objects in a circle is (n − 1)! So, it can be planted in 4 different ways...

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Describe how fossils help us understand the past. Provide an example.
Arte-miy333 [17]
Study of fossils has led to important new understanding about how life evolved on earth and about diseases, both ancient and modern. Fossils also help us understand past climates, including ice ages and periods that were warmer than our present climate. Knowledge from the study of fossils is helping geoscientists understand global warming and its effects. By studying the catastrophic extinction of the dinosaurs and many other life forms at the end of the Cretaceous Period, geoscientists have gained insight into the evolutionary implications of impacts by extraterrestrial objects. Investigating the physical and chemical characteristics of fossil organisms that lived during times of drastic climatic change helps us understand the implications of the changes we are making in our own environment. <span>Information about Earth history, practical help in finding energy resources, and information that helps us anticipate the effects of possible environmental changes are not the only benefits derived from fossils. hope this helps :)</span>
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if an action potential could not be received by the atrioventricular node, despite the propagation through sinoatrial node, what
Fofino [41]

You would predict this to occur as an opening of atrioventricular valves, atria contraction, and filling of ventricles with blood if an action potential could not be received by the atrioventricular node, despite the propagation through the sinoatrial node.

So, the correct options are B, C &E.

It enables a left atrium action potential, causing both atria to contract simultaneously before the ventricles do. The AV delay delays the contraction of the ventricles by slowing the rate at which the impulse reaches them. This is significant because it gives the atria enough time to finish contracting so that the greatest amount of blood may be discharged into the ventricles.

The right and left atria to have time to contract first (eject blood to the ventricles) before the ventricles contract, which is why the AV node delay is so crucial. The AV node is a modified myocardium.

Learn to know more about Action potential on

brainly.com/question/13606928

#SPJ4

 

The given question is incomplete. The complete question is:

If an action potential could not be received by the atrioventricular node, despite the propagation through the sinoatrial node, what do you predict would occur? select all that apply.

A. ventricles contract

B. atrioventricular valves open

C. atria contract

D. blood is pumped out of the ventricles

E. ventricles fill with blood

F. semilunar valves open

8 0
1 year ago
What percent of Earth’s fresh water is surface water available for human use?
strojnjashka [21]

Answer:

A only 1% of water is available for Us Humans to Use.

6 0
3 years ago
What effect will first-degree burns most likely have on the upper layer of the skin?
olga nikolaevna [1]

Answer:

First-degree burns affect only the epidermis, or outer layer of skin. The burn site is red, painful, dry, and with no blisters. Mild sunburn is an example. Long-term tissue damage is rare and usually involves an increase or decrease in the skin color.

Explanation:

hope this helps

3 0
3 years ago
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