The double helix is a description of the molecular shape of a double-stranded DNA molecule. In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they called a "double helix," in the journal Nature.
The second one changes in the amount of atmospheric gases because it think it might effect everyone including plants and animals because will all breath the same air rather than a mountain building it might affect the animals that like there.
Answer:
TTAGCCATG
Explanation:
Adenine pairs with Thymine
Guanine pairs with Cytosine
Hope this helps!!
It delivers energy as it circulates blood