It letter D. light-electromechanical sound-
1. Three nucleotide bases on mRNA (which are complementary to three nucleotide bases on DNA) are called codon. Each codon codes for the specific amino acid. So, for 1 amino acid in protein, there are 3 nucleotides on RNA (or DNA). That is why the coding sequence is three times as long as the <span>protein sequence it codes for.
2. There are 20 different amino acids, but there are more than 20 combinations of three nucleotide bases on DNA. There are 64 different combinations of three nucleotide bases on DNA, which is about 3 times more than the number of amino acids. So, different combinations of three nucleotide bases code for one amino acid and this is the reason why </span>the DNA sequence is so <span>different when the protein sequence isn’t</span>
Because the rock is laid down over time, the oldest rock (and fossils or whatever) will be in the lowest layer. As you go up, the age decreases - you are looking at younger rocks.
This doesn't tell you the *absolute* age of the rocks - you can't say from this evidence whether they are 100 million or 500 million years old. But you can see changes over history and you can get an ordering in time.
1. So you could subtract the mass from the weight of the liquid
The majority of mammals (including humans<span>) utilize a </span>double circulatory<span> system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.</span>
