Female gamer angus are called while male gametangia are called

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Prior to the mt. st. helens eruption on may 18, 1980, satellite and topographic views of the volcano were captured. based on the topographic map of mt. st. helens, what is the contour interval if the volcano height is 2,950 m? question 9 options: 600 m 400 m 750 m 500 m

To confirm when to exclude children from school it’s recommended that you refer to guidelines from which of the following organizations