The and are the glands that stimulate reproductive cycles.
a. testes . . thyroid
b. testes . . ovaries
c. ovaries . . thyroid
d. ovaries . . thymus

The terms that complete the sentence 'The and are the glands that stimulate reproductive cycles' are b. testes . . . ovaries. Testes are male gonads and ovaries are female gonads in animals. These organs are glands that are involved in reproductive cycles. They produce gametes which take place in reproduction, but they also produce hormones that stimulate reproductive cycles.

I’m not really sure