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___ are produced by the endocrine system.
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
Which of these is true?
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
Which of these is a hormone produced in the pancreas?
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
___ carries nutrients and oxygen to the developing embryo from its mother.
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
___ controls the amount of hormones the endocrine system sends.
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
Which of these is the process that continues life?
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
Fraternal twins ___.
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
Hormones from the endocrine system get to the bloodstream ___.
directly from glands
can be one boy and one girl
The umbilical cord
A negative-feedback system
Identical twins are always the same gender.
Hormones
reproduction
insulin
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