Answer:
human heart beats about 100,000 times in one day
Perhaps the 1st Trimester?
<span> Geographical</span> isolation refers to a population of organisms (such as plants and animals) that are separated from other species, thus unable to exchange genetic material with other organisms because of physical boundaries that isolate them or any unfavorable circumstances that prevent interbreeding.
Nucleic acids are polymers of nucleotides. The monomers of nucleic acids consist of a phosphate group, a five-carbon sugar, and a nitrogenous base.
<h3>Nucleotides and DNA</h3>
DNA (deoxyribonucleic acid) provides directions for its own replication.
A gene provides the directions to build a molecule of RNA.
A polynucleotide has a repeating sugar-phosphate backbone.
The structure of DNA is a double helix molecule, whereas RNA usually consists of a single polynucleotide strand.
Learn more about DNA here:
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