If fertilization does not occur, what happens to the levels of estrogen and progesterone?
a. Both estrogen and progesterone increase.
b. Estrogen increases, while progesterone decreases.
c. Both estrogen and progesterone decrease.
d. Progesterone increases, while estrogen decreases.
c. Both estrogen and progesterone decrease.
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Often it is important for health reasons to induce labor (i.e., smooth muscle contractions) in pregnant women. The drugs used for this purpose would most closely resemble
A. oxytocin. B. antidiuretic hormone. C. prolactin. D. cortisol.
During the ingestion of food or liquid, which one of the following tips to block the opening to the trachea?
A) pharynx B) bronchi C) epiglottis D) bronchioles E) larynx
When conducting a scientific experiment, which of the following is tested?
a) an observation b) a prediction c) a result d) a question e) the null variable
Heartworms (Dirofilaria immitis) are a type of roundworm that live in and obtain nutrients from the tissues of dogs. These invertebrates affect the function of the dog's circulatory system in a way that can lead to the dog's death. Which term best describes the relationship between heartworms and dogs?
a) mutualism b) predation c) parasitism d) competition