How are baby's made full explanation with details please help ​

The majority of animals reproduce sexually, which is where a sperm fertilizes an egg. A new life is formed when genetic information from each parents is combined through a process called meiosis. Each parents gives 23 chromosomes, so when the egg becomes fertilized, the baby has 46 chromosomes. In each round of cell division, cells undergo 4 stages - prophase, metaphase, anaphase, and telophase. If the sperm carries an x chromosome, the fetus will be female. But if the sperm carries a y chromosome, the fetus will me male.

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answer; i believe that the correct answer is (b) is a factor associated with physical activity and heart disease;

a. steroid--> influences moods in the limbic system

b. inhalant--> dissolves fatty tissue in the brain

c. marijuana--> changes how the hippocampus processes sensations