Can someone tell me what to do on this ):
Can someone tell me what to do on this ): - 1


Answer 1
Answer: On the periodic table, you will see that they are grouped into different groups. Well, on the right, you have the groups, obviously. You are supposed to match the elements to the group that it is in.

(If you don't know the groups, you can find one online under images.)
Hope this helps! Please give brainliest answer!

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Which reagent is used to test for protein?



Biuret reagent is the correct answer.


Biuret reagent is used to test the presence of the protein in a solution.

The biuret solution contains

  • Potassium hydroxide solution.
  • Hydrated Copper sulfate.
  • Potassium sodium tartrate.

Biuret reagent is a solution that is blue in color and when it reacts with protein the color gets a change to pink-purple due presence of several peptide bonds and when there is no protein present in the solution the color remains blue.

The biuret reaction takes place when the copper II ions placed in the solution as a cupric sulfate gets reduce to copper I ions due to the presence of peptide bonds and the color change is observed from blue to violet.

The biuret reagent is used to test for proteins. A biuret test, also known as a peptide bond test, is a chemical test used to measure the number of peptide bonds present in an analyte.

Biuret reagent consists of NaOH (sodium hydroxide) and hydrochlorofluorocarbons (sulfate) and potassium sodium tartrate. The tartrate is added to the chelate to stabilize the cupric ions.

When pure, the reagent is a pale blue color. However, when the reagent is mixed with protein, the reaction results in a light purple color. The deep blue/purple color is caused by a copper ion complex with a protein amide group.

To learn more about the biuret reagent, refer to the link:


Which types of plants wouldn't thrive in dry forests?angiosperms


Bryophytes and angiosperms might survive in dry forests but would not thrive. Bryophytes (mosses etc) prefer moist habitats to thrive. Angiosperms, or flowering plants, typically need at least moderate rainfall for the flowers to come to fruition and bear seeds, as well as for the seeds to be able to get down into the soil and take root.

Nitrogen is important to life because it is part of _____.DNA, amino acids, and proteins
plant photosynthesis
the air we breathe
lightning storms


DNA and amino acids hope this helps

Which sentence is the best example of a thesis statement for a literary analysis of Romeo and Juliet?A. In Romeo and Juliet, William Shakespeare demonstrates how the hatred between the Montagues and Capulets leads to the deaths of young lovers.

B. In Romeo and Juliet, William Shakespeare uses the technique of foreshadowing to let the audience know about the tragic ending of the love story between Romeo and Juliet.

C. In Romeo and Juliet, William Shakespeare shows how Romeo and Juliet get married secretly with the help of Juliet’s nurse and Friar Laurence.

D.In Romeo and Juliet, William Shakespeare tells the love story of a young couple who fail to end the feud between their families.


"In Romeo and Juliet, William Shakespeare demonstrates how the hatred between the Montagues and Capulets leads to the deaths of young lovers" is the sentence that is the best example of a thesis statement for a literary analysis of Romeo and Juliet. The correct option is the first option or option "A".



Below answer is wrong, I am unsure of the true answer.

Natural selection requires genetic variation, competition for limited resources, overproduction of offspring, and unequal reproductive success. The subset of finches that is capable of eating large seeds, while many others eat small seeds, is an example of which requirement?



Genetic variation


Darwin studied that different populations of finches on Galapagos island that are descended from the same species. Some species are evolved to eat nuts and large seed, some eat small seeds and some feed on insects and nectar.

So genetic variation occurred in different populations of finches which enabled them to bring changes in their beak according to the food resource they have chosen to feed on.  

So in Darwin's finches, genetic variation leads to new species which is a type of natural selection. Therefore subset of finches that can feed on large seeds and small seeds is an example of genetic variation.

How do rates of mutation "power" molecular clocks?


Molecular clocks use rates of mutation to measure evolutionary time. Mutations add up at a fairly constant rate in the DNA of species that evolved from a common ancestor. The more mutations that happened in each lineage, the greater is the differences between these lineages.