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tatiyna
3 years ago
9

Which valves produce the second heart sound when they snap shut?

Biology
1 answer:
Taya2010 [7]3 years ago
5 0
Answer: D) Pulmonary and aortic valves.

Explanation
There are two main heartbeats from a healthy heart.

The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.

The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.

Listening for heart beats is an essential part of cardiac auscultation.
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What factors might affect the production of more or less foam and gas in this experiment (e.g mor yeast, different types of suga
m_a_m_a [10]

More yeast gives more foam while the use of too many different types of sugars gives less foam.

Fermentation:

It is the process by which organisms break down glucose (sugars) to produce energy in the absence of the oxygen. During the fermentation, many types of by-products are formed such as alcohol, carbon dioxide, and acids.

In fermentation, the bubbles or gases, are produced by yeasts.

  • Here, if the amount of yeast is increased then the number of bubbles or foam will also increase.
  • If too many different types of sugars are used the number of bubbles or gases will decrease because yeast can only digest a certain type of sugars only.

Therefore, more yeast gives more foam while the use of too many different types of sugars gives less foam.

To know more about Fermentation:

brainly.com/question/6947990

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3 years ago
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How many servings of the bread, cereal group should you have each day? 2-3 ounces 3-4 ounces 6-8 cups 6-8 ounces
ivann1987 [24]
I believe its 2-3 oz. I'm not all that sure but after a bit a research it was the best answer i could get.
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3 years ago
Anne was observing a cell under a microscope which was undergoing binary fission. Which type of cell was Anne observing? 1 Eukar
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3 is the answer.  

Binary fission is a type of asexual reproduction and is the most common method of reproduction in prokaryotes. It may occur in some unicellular (single- celled) eukaryotes..

Eukaryotes use sexual recombination during reproduction to create or generate genetic variation and thus the resulting offspring will have a mixture of the parents' genetic characteristics. 


Prokaryotes on the other hand will simply produce clones of themeslves through binary fisson. After the process of replicating its own genetic material, the  prokaryote  simply divides into two daughter cells that are almost identical in size and that concludes the process.

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Answer:

The most inclusive level of organization is called the Biosphere.

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Different populations will form a community. The communities together with the environment they live in form an Ecosystem.

Lastly, The Biosphere is the most inclusive and encompasses all ecosystems on Earth

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3 years ago
The most primitive vertebrates whose reproductive pattern includes the amniotic eggs are the _____. the most primitive vertebrat
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<span>The most primitive vertebrates whose reproductive pattern includes the amniotic eggs are the reptiles.
An amniotic egg is filled with amniote, which are these membranes that have fluid in them. They serve to protect the embryo and enable it to survive any harsh conditions that may harm it. These cells have protein shells as well as calcium that provide further protection. 
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