Irregular ovulation may result from a hormonal imbalance that is caused by
A) an overactive thyroid gland.
B) frequent migraine headaches.
C) underproduction of prolactin.
D) a tumor in the ovary or pituitary.
D) a tumor in the ovary or pituitary.
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Why don't plant cells use a contractile ring to divide their daughter cells?
A. Plant cells don't have an actin cytoskeleton. B. Plant cells don't form daughter cells. C. A contractile ring can't "pinch" a cell wall. D. Plant cells don't have plasma membranes.
A couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. They are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. Which hormones are they?
A. adrenocorticotropic hormone (ACTH) and corticotropin-releasing hormone (CRH) B. insulin and glucagon C. oxytocin and luteinizing hormone (LH) D. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about sex hormones? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Two species that interact closely for generations through symbiosis often _______________, regardless of whether one species helps or harms another. Each species acts as a selective agent that shifts the range of variation in the other
Fill in the blank(s) with correct word
A tracer is a substance with what attached to it?
a. water b. carbon c. a radioisotope d. an ion e. a positron