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- Describe how the reproductive structures of each organism are adapted towards the given characteristics of the animals: 1. Solitary and slow-moving lifestyle of Lissachatina fulica 2. Saltatory mode of life in Rhinella marina 3. Temperature regulation of mammalian sperm cell productionA friend of yours wants to better understand the difference between estrous and menses in mammals. Which answer below would provide a good way of explaining the main difference? O only menstrual cycles are affected by seasonal changes throughout the year O copulation normally occurs across the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation O the endometrium shed by the uterus during the estrous cycle is reabsorbed with no extensive fluid flow out of the body, whereas the shed endometrium of menstrual cycles is excreted from the body O behavioral changes during estrous cycles are much less apparent than those of menstrual cycles MacBook ProWhat is "ecdysis"? O The outermost covering of an ovum that undergoes external fertilization. O A form of asexual reproduction The act of emerging out of the old cuticle during molting. The transformation of a larva into an adult that looks completely different from the larval form.
- The species Taenia saginata is a parasitic worm of humans. The parasite's life cycle is as follows: Hermaphroditic adults live in the small intestine cavity of an infected human. The adult worm consists of rings that are produced in the anterior region of the worm, in which there is production of male gametes which fertilize female gametes then these rings (called proglottids) detach from the posterior end of the worm and exit in the external environment through the anus of the infected human. The eggs resulting from fertilization, present in the proglottids, are released and can infect a bovid if they are ingested along with grass. In the bovid, the developing eggs are particularly localized in the muscles of the bovid and turn into a shape called a cysticercus (each egg becomes a cysticercus). 1-Specify which species is the definitive host of the parasitic worm, justifying your answer 2- Specify the type of parasitism of this worm, justifying your answer 3-Specify which is (are) the…Figure 18.17 Which of the following statements about hormone regulation of the female reproductive cycle is false? a. LH and FSH are produced in the pituitary, and estrogen and progesterone are produced in the ovaries. b. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. c. Both progesterone and estrogen are produced by the follicles. d. Secretion of GnRH by the hypothalamus is inhibited by low levels of estrogen but stimulated by high levels of estrogen.Spermatogenesis usually occurs during the ___________ and continues in the _________ stage in some insects. The _________ is composed of germ cells and somatic mesodermal cells. Each follicle contains a large _________ that apparently serves as trophic function. The spermatogonia undergo several __________ divisions to form the primary spermatocytes. The primary spermatocytes become _________ in somatic cells. The primary spermatocytes undergo _________ and produce haploid daughter cells in the next region. In the zone of maturation and reduction, the primary spermatocytes become _______ and _________ respectively. 10.The secondary spermatocytes become transformed into ____________. When the _________ in which they have been encased throughout spermatogenesis rupture, 12.the spermatozoa enter the vas efferens and the vas deferens and lodge in the _________. When the spermatozoa are released into the ducts, they remain in bundles known as _______ held together by a gelatinous…
- What is a dauer larva ? It's a larva from a special variant of C. elegans that was first identified in samples from soil in Germany It is a larva that shows accelerated development in highly nutritious environments Dauer is just the technical term for "hermaphrodite" - so dauer larva means hermaphrodite adult It's a larva that arrests development in a low metabolic and enduring stage, caused by harsh environmental conditions. The larva will remain in the dauer stage until the conditions improve, at which point they'll resume development.Which of the following groups include at least some members that exhibit internal fertilization? Choose all that apply. O Amphibians O Reptiles Birds MammalsWhich of the following occurs to the blastocoel during Xenopus development? is replaced by the expanding archenteron becomes the archenteron gives rise to the mesoderm gives rise to the endoderm