International units are .

a. no longer used on vitamin labels
b. ½ the vitamin's weight
c. three times the vitamin's weight
d. used to measure a vitamin's biological effects
e. preferred for water-soluble vitamins

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

happy to

pls mark as brainliest

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"do a testcross with a homozygous recessive plant."

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d