Which of the following statements regarding animal development is/are correct? Select True or False for each statement.T/FThe neural tube forms after organogenesis is completeT/FThe blastocyst is formed during cleavageT/FDuring cleavage, the zygote divides rapidly without growth, forming a mass of cellsT/FAnimals have two germ layers

In sperm competition, what is 'second-male advantage'?a. the observation that when females mate with two males, each male fertilizes the same number of eggsb. the observation that when females mate with two males, the second male fertilizes most of the eggsc. the observation that females routinely mate with at least two males before laying eggs or becoming pregnantd. the observation that accessory fluids prevent matings by second males—for example, by forming copulatory plugs

Add labels to the figure that follows, which illustrates female internal reproductive organs.

What happens to the egg cell and the remains of the tissue it developed in at ovulation?

Which of the following is not properly paired?a. seminiferous tubule—cervixb. vas deferens—oviductc. testosterone—estradiold. scrotum—labia majora

Which of the following is properly paired?(A)seminiferous tubule—cervix(B)vas deferens—oviduct(C)corpus luteum—Sertoli cell(D)scrotum—clitoris

A sperm cell follows which path?a. seminiferous tubules, epididymis, vas deferens, urethra;b. urethra, vas deferens, seminiferous tubules, epididymis;c. seminiferous tubules, vas deferens, epididymis, urethra;d. epididymis, seminiferous tubules, vas deferens, urethra;e. epididymis, vas deferens, seminiferous tubules, urethra

Peaks of LH and FSH production occur duringa. the menstrual flow phase of the uterine cycle.b. the beginning of the follicular phase of the ovarian cycle.c. the period just before ovulation.d. the secretory phase of the uterine cycle.

True or false: The corpus luteum is retained upon implantation due to the presence of the hormone human chorionic gonadotropin (hCG).