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Tpy6a [65]
3 years ago
15

A scientist performs a controlled experiment. this means that select one:

Biology
2 answers:
musickatia [10]3 years ago
7 0

Answer: d. One experiment is performed, but the scientist control the variable.

Explanation:

In the controlled experiment the independent variable is changed in an orderly manner so that accurate changes can be observed on the dependent variable. Also in this a controlled group is also used for comparision with the changes in other variables.

andrezito [222]3 years ago
5 0
D. one experiment is performed but the scientists control the variables
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Karen knows that trees use energy from the sun to make food. she wants to plant several trees in her backyard, but she is worrie
melisa1 [442]

Karen is NOT correct. This is because the sun's energy is a renewable resource. This means that its  use is sustainable hence it is a substance of economic value that can be replaced or replenished in the same or less amount of time as it takes to draw the supply down. Though the sun is a finite resource,  it cannot be depleted within human timescale.






7 0
3 years ago
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The number of ducks in a pond is equal to the square root of the number of fish, and the number of turtles is equal to the cube
brilliants [131]

Answer:

There are 64 fish, 8 ducks and 4 turtles.

Explanation:

From the question, there can be from 2 to 99 fish in the pond. However, there cannot be fractions in the number of fish, ducks or turtles. Hence, the number of fish must have both of a perfect square and perfect cube. The perfect squares from 2 to 99 are 4, 9, 16, 25, 36, 49, 64 and 81. The perfect cubes from 2 to 99 are 8, 27 and 64. Since only 64 fits both criteria, the number of fish is 64. The number of ducks is the square root of number of fish, which is the square root of 64. The square root of 64 can be either positive 8 or negative 8. However, there cannot be negative numbers, so there are 8 ducks in total. The number of turtles is the cube root of the number of fish, which is the cube root of 64 and it is 4.

7 0
2 years ago
A scientific _______ must be testable and capable of being proven false.
Vinvika [58]
<span>A scientific theory must be testable and capable of being proven false. This is very important for these theories to be dealt with because they become the dependencies when they are applied for the analysis of the concepts and problem solving.</span>
7 0
3 years ago
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What part of the body is not working as it should when you have asthma
Nutka1998 [239]

Answer:

The Lungs

Explanation:

Asthma is a lung disease that affects your airways. With asthma, the lining of your airways is constantly hypersensitive, resulting in redness and swelling (inflammation). It's similar to how sunburned skin turns red, irritated, and sensitive. The airways become hypersensitive to things you are exposed to on a daily basis, or asthma "triggers." a trigger could be a common cold, stress, changes in the weather, or environmental factors like dust, chemicals, smoke, or pet dander.

Airway remodeling can occur as a result of poor asthma management. When asthma is untreated or poorly managed, it can lead to airway remodeling, which is a serious condition. The lungs become scarred, asthma medications become less effective, and less air can pass through your airways. It is not necessary to remodel the airways.

Hope this helps and if it does, don't be afraid to give my answer a "Thanks" and maybe a Brainliest if it's correct?  

8 0
3 years ago
I need to know which are prokaryotes and which are eukaryotes please!
nirvana33 [79]

9. P

10. E

11. E

12. E

13. P

14. E

15. Both

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3 years ago
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