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Anettt [7]
3 years ago
8

What is a substance that cannot be broken down into other substances by chemical reactions?

Biology
1 answer:
vovikov84 [41]3 years ago
3 0
Element 
An element is a pure substance that cannot be broken down into other substances, an element is made up of only one type of atom. 
Hope this helps :) 
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Explain how a mutation near, but outside of, the coding region of Pitx1 may cause a loss of pelvic fins without pleiotropic effe
ipn [44]

Since the Pitx1 gene codes for a protein crucial im lower limns development, a mutation occurring near Pitx1 gene will affect refikjs around the lower limbs but not those far away from it.

<h3>What are mutations?</h3>

Mutations refers to alterations or error that occur which change the original sequence of nucleotides in a DNA molecule.

The Pitx1 gene is a gene that codes for a protein that involved in development of the lower limbs.

A mutation near but outside of the coding region of Pitx1 may cause a loss of pelvic fins without pleiotropic effects on the pituitary gland and jaw because the pelvic fins form part of the lower limbs whole the jaws and the pituitary gland are not found in the lower limbs.

Therefore, the mutation occurring near Pitx1 gene will affect regions around the lower limbs but not those far away from it.

Learn more about mutation at: brainly.com/question/17031191

4 0
2 years ago
What are the 2 elements involved in the sun's production of energy?
tatuchka [14]
There is only one main element involved in the fusion reactions inside the sun; Hydrogen, but if you need a second element then it is more than likely that the question is asking for the isotope of hydrogen that is called <span>deuterium.

So basically, Hydrogen and Deuterium; an isotope of hydrogen</span>
8 0
3 years ago
Which of these is the lowest subgroup?<br> 1.) Order<br> 2.) kingdom<br> 3.) Genus<br> 4.) Species
ddd [48]
The answer to this question would be :4.) SpeciesIn taxonomy, the organism will be divided into different groups based on a specific character from that organism. It could be an organ 
The sequence from top to bottom would be:
<span>life
<span>domain
</span><span>kingdom
</span><span>phylum 
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The lowest subgroup is called species</span></span>
3 0
2 years ago
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Which statement describes Redi's experiment, which helped disprove spontaneous generation?
Lelu [443]

Answer:

He examined covered and uncovered meat to determine that maggots came from eggs.

Explanation:

Prior to Redi's experiment and other supporting experiments, it was formerly believed that life could emanate from non-living things, for example, the generation of maggots from rotting meat.

In 1668, a scientist called Francesco Redi disproved the idea of spontaneous generation. He did this when he experimented that the maggots from meats are only as a result of eggs laid by flies when they perched on the meat.

He placed the meat in two jars; an uncovered jar and another in a covered jar with a cloth, after several days, the uncovered jar had maggots on the meat, while the covered jar had no maggot on the meat, but on the cloth. With this experiment, he was able to demonstrate that the maggot arose from the eggs of the flies, not the meat itself which is nonliving and hence, disproved the idea of spontaneous generation.

7 0
3 years ago
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Two chronic medical conditions that dialysis patients frequently have in addition to kidney failure are
sergiy2304 [10]
<span>Dialysis patients are prone to a myriad of medical anomalies. The most common medical conditions that dialysis patients have in addition to kidney failure are hypertension and diabetes. Hypertension is the onset of high blood pressure, and diabetes is a disease that prevents the pancreas from regulating glucose levels in the body.</span>
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