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Sveta_85 [38]
3 years ago
15

The main reason that it's important to test only one variable at a time is so that

Biology
2 answers:
OleMash [197]3 years ago
4 0
This is to make sure the test is reliable because it can happen that the two variables being tested affect each other skewing results
lozanna [386]3 years ago
3 0
Because if we're simultaneously moving/manipulating two different variables it can be very hard to determine why one variable is changing and why the other is changing. While this can be done with more complicated experimental designs, it usually is the case that scientists will only manipulate one variable and not two different ones. 
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Gas makes things buoyant, why ? And what are ways that this could be useful?
ryzh [129]

Answer:

Gas makes things buoyant by making the volume of an object lighter than the surrounding fluid it is trying to displace.

Gas Buoyancy is useful in the following ways;

• Airships

• Steel ships and

• All floating and flying vessels

Explanation:

Buoyancy is the tendency of an object to float in a fluid such as air or water. It is a phenomenon that was theorized by the mathematician, Archimedes known as the Archimedes Principle.

It states that the upward buoyant force that is exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces.

The principle explains the reason why objects float and fly.

So, when an object is immersed in a fluid, it can float due to the upward force exerted by the fluid on the object. But for this to happen, the object has to weigh less than the fluid it is displacing.

This is where the use of a gas comes into play.

Because the object may be heavier than the surrounding fluid it is trying to displace, it is filled with a large amount of gas (usually hydrogen and/or helium) which is lighter. This makes the volume of the gas and the object put together lighter than that of the surrounding air.

This is what causes objects to float or fly

7 0
2 years ago
Without the presence of sea otters, sea urchins would otherwise overgraze kelp beds, dramatically changing the marine community
densk [106]
I think it is keystone.  If they were not there the population of urchins would go up and the kelp would go down.
6 0
3 years ago
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Is it good or bad to have exactly the same hereditary traits?​
N76 [4]

Answer:

Both

Explanation:

Well,it has both good and bad aspects.In my opinion,hereditary traits possess good side through the genetic factors whereas it shows negativity as it may cause some diseases or hard complications.

3 0
3 years ago
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Any good hypothesis idea?​
Lorico [155]

Answer:

is plant growth affected by temperature

Explanation:

4 0
3 years ago
Mushrooms and shelf fungi are classified as
svet-max [94.6K]
Mushrooms and shelf fungi are classified as  cup  fungi.
7 0
3 years ago
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