Brothers, Patrick and Michael, do not look very much alike. Patrick has green eyes and blond, curly hair like his mother. Michael has blue eyes and dark brown, straight hair like his father. These directly observable characteristics are

At a point when a sperm cell fertilizes an ovum, a(n) __________ is formed

a) chromosome b) zygote c) embryo d) fetus

Although women can take hormone replacement therapy drugs to manage the symptoms of menopause, there is no comparable treatment for men who experience andropause

Indicate whether the statement is true or false