Yes it does because the human brain development is created through environmental and genetic influences
I am going to go with steroids because they are a type of lipid.
It is the manipulated variable. It is changed in an experiment to see how it would effect another variable.
Answer:
Guanine
Explanation:
There are <em>four</em> nitrogenous bases in DNA, <em>two purines</em> (adenine and guanine) and <em>two</em> <em>pyrimidines</em> (cytosine and thymine)
Adenine always bonds with thymine, and cytosine <em>always bonds with</em> guanine.