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monitta
3 years ago
10

What is the most difficult part of a controlled experiment?

Biology
2 answers:
siniylev [52]3 years ago
8 0

Answer:

The correct answer is option 1.) "testing only one variable".

Explanation:

One of the basis of scientific experimentation is to test one variable at the time in order to make sure that the obtained results are a direct consequence of the variable of study. However, testing only one variable at the time is not an easy task. It is necessary to establish a negative control which only difference is the absence of the variable, and a positive control using a variable that the scientist know is going to produce a response.

Anna71 [15]3 years ago
4 0
1. Testing only one variable
A controlled variable means its the one that stays the same. In a controlled experiment, it means there is only one manipulated, (changed) variable. 
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Water is an example of a(n) _____.
ale4655 [162]

Answer: The correct answer is liquid.

Explanation:

Liquid, gas and solid are the states of the matter.

Solid: In the solid, the inter molecular force of attraction is strongest. The particles are more tightly packed in this in comparison to liquid and gas. It has definite shape and volume. For example, iron.

Gas: In the solid, the inter molecular force of attraction is very less. The particles are not tightly packed in this in comparison to solid and liquid. For example, hydrogen gas.

Liquid: In the liquid, the inter molecular force of attraction is not very strong. The particles are loosely packed. It has no definite shape but has definite volume. For example, water.

Therefore, water is an example of a liquid.

5 0
4 years ago
Read 2 more answers
In fruit flies, L = long wings and I = short wings. When a long winged fly is crossed with a short winged fly, the off spring ex
stellarik [79]

Answer:

Genotype of long winged fly is Ll

Genotype of short winged fly is ll

Explanation:

Given

Allele for long wing trait is "L"

Allele for short wing trait is "l"

When a long winged fly is crossed with a short winged fly, half of the offspring have long wings and other half have short wings as the ratio is 1:1

Let us say that the genotype of long winged fly is Ll

and the genotype of short winged fly is ll

The cross between the two will produce following offspring

Ll * ll

Ll, Ll, ll, ll

Out of four off spring two have long wings (Ll)

and the other two have short wings (ll)

Thus the ration of long to short wing offspring is 2:2 i.e 1:1

3 0
4 years ago
What happens as pigments are mixed together?
andriy [413]
When pigments are mixed together, more colors are being absorbed which results to few colors that will be reflected. Each pigment absorbs and reflects light which results to the "color" or hue that we see. When these pigments are to be mixed, then more wavelengths would be absorbed which results to lesser reflection.
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3 years ago
What determines which stage occurs after a supernova?
ch4aika [34]
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7 0
3 years ago
How to plants obtain more sunlight
Volgvan
The correct answer is:      They lean towards the light 
5 0
4 years ago
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