The male sperm determines whether it is a girl or a boy, if it has XX chromosomes it is a girl if it has XY chromosomes it is a boy. Males can only receive Y chromosomes from their fathers.
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Answer:
A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.
Explanation:
Answer:
D (A human being shivers when exposed to cold weather.)
When you shiver that is how your body reacts to stay warm and maintain homeostasis. in doing so your behavior changes and you try to find somewhere warm.
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