Ultimate control of testes development is by the ________ which secretes ________.
A. anterior pituitary; testosterone
B. hypothalamus; gonadotropin-releasing hormone
C. anterior pituitary; gonadotropin-releasing hormone
D. seminiferous tubules; inhibin
E. hypothalamus; testosterone
Answer: B
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Some bryophyte species are ____, meaning that they grow independently on another organism
a. tracheophytes b. epiphytes c. parasites d. charophytes e. rhizoids
Which plant hormone listed below is responsible for the symbiotic relationship shown in the accompanying figure?
a. auxin b. gibberellin c. cytokinin d. jasmonic acid e. abscisic acid
The end result of the process in Figure 20-1 is:
a. sympatric speciation.
b. allopolyploidy.
c. hybridization.
d. rapid speciation.
e. All responses apply
When a muscle is stimulated before the muscle can fully relax, it can cause ________
A) tendinitis B) summation C) muscle failure D) muscle twitch