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gulaghasi [49]
3 years ago
9

Why are theories important to science, if they cant be proven? Can they be changed/ modified? ( Please answer simply)

Biology
1 answer:
N76 [4]3 years ago
6 0

Answer: A scientific theory cannot be proven correct because there is no way to look into the future and find out if the theory is ever revised. Theories tend to change greatly as new discoveries are made.

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Describe one of the three types of volcanoes we discussed today
White raven [17]

Answer: Shield, Cinder Cone, and Composite volcano.

Explanation: A shield volcano is a volcano that is formed with lava is very runny and spreads to a wide area and then cools to form a shield volcano. These are common at Hawaii.

A cinder cone volcano is the smallest volcano. It's made from minor eruptions and cinders. They're short and usually erupt for a short period of time. Mexico's Parícutin volcano, is a cinder cone.

Composite or stratovolcanoes are the most common type of volcano. They form from thick, less runny lava. Since it is so thick, it cools then makes the volcano taller. Mount st helens, in Washington state is a stratovolcano.

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3 years ago
How is rna different from dna?
Sindrei [870]
RNA has Uracil as base with Adenine but DNA has Thymine at place of that...
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3 years ago
Why does DNA flow toward the positive electrode of the gel chamber?
Digiron [165]

Answer:

DNA molecules have negative charges, and so when placed in an electric field they migrate toward the positive pole.

Explanation:

Electrophoresis is a technique that <u>uses differences in electrical charge to separate the molecules in a mixture</u>. DNA molecules have negative charges, and so when placed in an electric field they migrate toward the positive pole. The rate of migration of a molecule depends on two factors, its shape, and its charge-to-mass ratio.

A gel, which is usually made of agarose, polyacrylamide, or a mixture of the two comprises a complex network of pores, through which the DNA molecules must travel to reach the positive electrode. The smaller the DNA molecule, the faster it can migrate through the gel. Gel electrophoresis, therefore, <u>separates DNA molecules according to their size.</u>

6 0
3 years ago
100 Points!
dusya [7]

Answer:

Option B

Explanation:

Answer A is incorrect as the data is not analyzing how many fish each lake has, but rather the pelvic score of the fish. Answer C is incorrect as the graph shows that the fish in Frog Lake are complete, and that there are 0 fish that have reduced or absent pelvic scores, therefore the fish don't have varying pelvic structures. Answer D is incorrect because the data is not analyzing the size of the fish and again is only analyzing the pelvic score of the fish. This being said by process of elimination the answer would be option B, as the fish in Bear Paw Lack lack complete pelvic spines but rather have reduced or absent pelvic spines.

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3 years ago
The form of oxygen that combines three oxygen Adams into each molecule is called
Mama L [17]
Hello

The form of oxygen that combines three oxygen atoms into each molecule is called<span>. Poll Everywhere.

Have a nice day</span>
3 0
3 years ago
Read 2 more answers
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