Q: What is contained in the skin of brightly colored poison dart frogs? Read this paragraph and choose the correct option from the provided answers: Adrian Pingstone (Wikimedia: Arpingstone). Brightly colored poison dart frogs have toxins in their skin . Public Domain. Choices: - spores - acid - poison - toxins A:
toxins

Q: The value that occurs most often in a data set is called the? Read this paragraph and choose the correct option from the provided answers: The mode is the most common value. It is the value that occurs most often. Choices: - median - mean - type - mode A:
mode

Q: Q: What kind of relay occurs between the uterus, hypothalamus, and the posterior pituitary to assure an adequate supply of the hormone oxytocin during childbirth? Read this paragraph and choose the correct option from the provided answers: Labor and Birth Labor is the physical efforts of expulsion of the fetus and the placenta from the uterus during birth (parturition). Toward the end of the third trimester, estrogen causes receptors on the uterine wall to develop and bind the hormone oxytocin. At this time, the baby reorients, facing forward and down with the back or crown of the head engaging the cervix (uterine opening). This causes the cervix to stretch and nerve impulses are sent to the hypothalamus, which signals for the release of oxytocin from the posterior pituitary. The oxytocin causes the smooth muscle in the uterine wall to contract. At the same time, the placenta releases prostaglandins into the uterus, increasing the contractions. A positive feedback relay occurs between the uterus, hypothalamus, and the posterior pituitary to assure an adequate supply of oxytocin. As more smooth muscle cells are recruited, the contractions increase in intensity and force. There are three stages to labor. During stage one, the cervix thins and dilates. This is necessary for the baby and placenta to be expelled during birth. The cervix will eventually dilate to about 10 cm. During stage two, the baby is expelled from the uterus. The uterus contracts and the mother pushes as she compresses her abdominal muscles to aid the delivery. The last stage is the passage of the placenta after the baby has been born and the organ has completely disengaged from the uterine wall. If labor should stop before stage two is reached, synthetic oxytocin, known as Pitocin, can be administered to restart and maintain labor. An alternative to labor and delivery is the surgical delivery of the baby through a procedure called a Caesarian section. This is major abdominal surgery and can lead to post-surgical complications for the mother, but in some cases it may be the only way to safely deliver the baby. Choices: - pressure feedback - affirmative feedback - currents feedback - positive feedback A:
A: positive feedback

Question: Q: Every chemical reaction between molecules involves breaking and forming of what? Read this paragraph and choose the correct option from the provided answers: Choices: - orbits - ions - atomic pathways - bonds A:
Answer: bonds

*Question*
Q: What are the layered rocks that form when certain prokaryotes bind thin films of sediment together? Read this paragraph and choose the correct option from the provided answers: Choices: - stalagmites - quartzes - stalactites - stomatolites A:
**Answer**
stomatolites

*Question*
Q: How many eyelid membranes do frogs have? Read this paragraph and choose the correct option from the provided answers: In order to live on land and in water, frogs have three eyelid membranes: one is see-through to protect the eyes underwater, and the two other ones let them see on land. Frogs also have a tympanum , which acts like a simple ear. They are found on each side of the head. In some species, the tympanum is covered by skin. Choices: - two - four - one - three A:
**Answer**
three