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natima [27]
3 years ago
11

Earth scientists study the history of the earth. What are some ways that they determine the age of the earth or geologic feature

s (for example, what did William Smith do?)? Which techniques are most accurate to help with this process? How has our understanding of the age of the earth changed over time
Biology
1 answer:
Charra [1.4K]3 years ago
6 0

Answer:

To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.

Explanation:

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The DNA sequence that produced the mRNA sequence uracil, guanine, cytosine, guanine adenine uracil adenine adenine
vesna_86 [32]

Answer:

The DNA sequence that produced the mRNA sequence uracil, guanine, cytosine, guanine adenine uracil adenine adenine during transcription is adenine, cytosine, guanine, cytosine, thymine, adenine, thymine, thymine.

Explanation:

Transcription of DNA into messenger RNA (mRNA) is a process in which the specific nucleotide sequence is transferred from one molecule to another, through the synthesis of mRNA molecules from a DNA strand.

The complete transcription process is done by nitrogenous base complementarity, where mRNA receives the sequence of complementary bases according to the DNA sequence:

  • <em>Adenine</em><em> is complemented with uracil, since in RNA the thymine is substituted by this uracil. </em>
  • <em>Thymine</em><em> is complemented with adenine. </em>
  • <em>Cytosine</em><em> is complemented with guanine. </em>
  • <em>Guanine</em><em> is complemented with cytosine. </em>

Thus an <u>uracil mRNA sequence, guanine, cytosine, guanine adenine uracil adenine U-G-C-G-A-U-A-A comes from a DNA sequence adenine, cytosine, guanine, cytosine, thymine, adenine, thymine, thymine or A-C-G-C-T-A-T</u>.

6 0
2 years ago
which of the following statements illustrate how fossils record the evolution of defense mechanisms over time?
Veronika [31]

Answer:

lugi

from super smash brus

Explanation:

7 0
3 years ago
In hogs, a dominant allele B results in a white belt around the body. At a separate locus, the dominant allele S causes fusion o
GREYUIT [131]

Answer:

D) B/b;S/s (x) b/b;s/s

Explanation:

Parent 1 : belted syndactylous sow

Since it is showing dominant phenotype for both the traits, it can either be BBSS or BbSs

Parent 2: unbelted cloven-hoofed

Since it is showing recessive phenotype for both the traits, it can only have bbss genotype

If we assume parent 1 to be BBSS all the resulting progeny with bbss will have dominant phenotype which is not the case.

If we assume parent 1 to be BbSs:

BbSs X bbss =

BbSs : belted syndactylous

bbSs : unbelted syndactylous

Bbss : belted cloven

bbss : unbelted cloven

The progeny will be produced in 1:1:1:1 ratio which means that each of them will make 25% of the population.

Hence, parent 1 will have BbSs genotype and parent 2 will have bbss genotype

7 0
3 years ago
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