Which statement best describes hormones?
a.) hormones are only made of peptides.
b.) hormones travel attached to white blood cells.
c.) hormones travel through the bloodstream.
d.) hormones are secreted through ducts.

The correct answer is C) Hormones travel through the bloodstream.

Hormones are signaling molecules which are synthesized by endocrine glands and released into the blood stream so that they could reach the target organ where they need to show their effect. Chemically, hormones can be peptides or steroids. So, option A is partially correct. Option D is incorrect because hormones are not secreted through ducts. There are certain exocrine glands in our body which have ducts but those glands instead of secreting hormones secrete substances like sweat, mucous etc. Option C is also incorrect.

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what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements