1. 2. 3. Which are true about gastrula? I. II. III. IV. ABCD А с B The presence of three germ layers A hollow fluid-fill

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1. 2. 3. Which are true about gastrula? I. II. III. IV. ABCD А с B The presence of three germ layers A hollow fluid-filled ball of cells C D The blastocoel is replaced by archenteron The presence of dorsal neural tube to the notochord Which of the following statements about hormone regulation of the female reproductive cycle is false? A I and III I and IV II and III II and IV LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles. Secretion of GnRH by the hypothalamus is inhibited by low levels of estradiol but stimulated by high levels of estradiol. Sperm are produced in the A B C D scrotum seminal vesicles seminiferous tubules prostate gland