During infancy and childhood, the most important stimulus of epiphyseal plate activity is during infancy and childhood, the most important stimulus of epiphyseal plate activity is thyroid hormones testosterone estrogen growth hormone

   Growth hormone

Explanation:  The epiphyseal plate is actually the cartilage plate at the end of every long bone, and because of this, the most important stimulus is growth hormone. This is important during infancy and childhood. Testosterone and oestrogen are hormones that determine secondary sex characteristics and body characteristics, respectively, in men and women. Thyroid hormone produced in the thyroid gland thanks to iodine. Thyroid hormone is therefore a substance which is exported to the bloodstream.

well this isn't a question but if you are asking if it is true or false it is, true.