a notochord is definitely the backbone. it appears as a tiny flexible rod made from mesoderm cells. which is one third of the layer of embryos.
In DNA replication, <u>adenine</u> pairs with thymine, and cytosine pairs with <u>guanine</u>.
In the field of science, DNA replication can be described as a process by which DNA makes copies of itself.
DNA is made of four nucleotide bases, deoxyribose sugar, and phosphate groups. The four nucleotide bases present in the DNA are adenine, guanine, thymine, and cytosine.
Adenine and guanine are nucleotide bases that have two carbon-nitrogen rings and are referred to as purines. Thymine and cytosine are made of one carbon-nitrogen ring and are referred to as pyrimidines. In the DNA, adenine pairs with thymine, and cytosine pairs with guanine.
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Answer:
1) b] X, W, Z, Y
2) a] W
3) b] On top and left of the box.
4) c] A child always inherits one dominant and one recessive allele.
