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AnnZ [28]
3 years ago
6

This is 7th grade science plz help

Biology
1 answer:
Darya [45]3 years ago
4 0
The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, scientist calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years. 
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What’s meant by the term genetic variation?
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Genetic variation is a term used to describe the variation in the DNA sequence in each of our genomes. ... Individuals of a species have similar characteristics but they are rarely identical, the difference between them is called variation

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PLEASE ANSWER ASAP!!
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Mitochondrial DNA can be traced for generations. It is because of the fact that   unlike nuclear DNA, mitochondrial DNA rarely gets mutated. The frequency of mutations in the mitochondrial DNA is approximately one every 3,500 years per nucleotide. That is why mitochondrial DNA of a person is almost similar to his/her direct maternal ancestor. So, it can be used to match lineages amongst people.

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A phage is a virus that infects bacterial cells. A phage virus is shown above. What component of the phage virus is indicated by
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<u>D) the nucleic acid (either DNA or RNA)</u>

<u />

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Phages, or bacteriophages are viruses that infect bacteria.They have varying shapes, and sizes, and may contain one of two kinds of nucleic acid; these are RNA and DNA.

The nucleic acids  are made up of nucleotides. These are  genetic storage biomolecules made up of the monomers ribonucleic acid (RNA) deoxyribonucleic acid (DNA).

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