A psychologist asks 3-year-old children to explore a room filled with toys either with or without their mothers present. The time the children spend exploring is measured. Exploration time is a(n) variable and the presence/absence of the mother is a(n) variable.

answer; collective security;

answer; through play and social interaction;

answer; the sound of a train whistle makes a woman think of an old friend; //

the smell of grass makes a by feel that spring is the best; (apex);

answer; the smaller of the two reciprocal products of translocated chromosomes is lost; after several cell divisions, only the larger of the two translocated chromosomes remains,its reciprocal is lost;