A) anaphase. It's when the pairs of chromosomes are pulled apart by spindle fibers.
The nucleotide component that contains nitrogen is base.
I'm thinking the brain. The brain produces hormones and chemicals that tell the body to grow. And you also need to think a lot when trying to survive, which is when the brain comes in handy.
Heartburn is the rising of excess stomach acid touching the top of the stomach wall causing irritation and discomfort feeling like a burning grumbling sensation this usually is commonly triggered by spicy or GMO based foods.