Fact 1: Sex hormones are chemical messengers that control sexual development and reproduction. Fact 2: Chemical messengers carry signals from one nerve branch to another. Given the two facts above, _ carry signals that control sexual development and reproduction.?
Options are:
(1). photons.
(2). sex hormones.
(3). nerves.
(4). Most plants.
(5). organs.
(6). orchids.
(7). animals.
(8). insects.
Answer:
(2).