Q: What force holds together both types of star clusters? Read this paragraph and choose the correct option from the provided answers: Star clusters are small groups of stars. A star cluster is smaller than a galaxy. There are two main types, open clusters and globular clusters. Both types are held together by gravity. Choices: - weight - magnetism - inertia - gravity A:
gravity

(Question)
Q: How many classes of biochemical compounds are there? Read this paragraph and choose the correct option from the provided answers: Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemical compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids. ) Proteins contain carbon, hydrogen, oxygen, nitrogen, and sulfur. Protein molecules consist of one or more chains of small molecules called amino acids. Choices: - one - five - three - four A:
(Answer)
four

Ques: Q: Labor is the muscular contractions to expel the fetus and placenta from where? Read this paragraph and choose the correct option from the provided answers: Visit this website (http://openstaxcollege. org/l/embryo_fetus2) to see the stages of human fetal development. Labor is the muscular contractions to expel the fetus and placenta from the uterus. 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 the release of oxytocin from the posterior pituitary. Oxytocin causes 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. Choices: - lungs - anus - tumors - uterus A:
Ans: uterus

(Q).
Q: Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms? Read this paragraph and choose the correct option from the provided answers: Antibodies These proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms (such as bacteria and viruses). When an antibody binds to its target, it is tagged for destruction. This tag is recognized by white blood cells, which complete the process. Some antibodies also partially or completely deactivate their targets while waiting for further help from white blood cells. Choices: - enzymes - collagen - essential amino acids - antibodies A:
(A).
antibodies

Ques:Q: What is used to record seismic waves? Read this paragraph and choose the correct option from the provided answers: A seismograph is a machine that records seismic waves. In the past, seismographs produced a seismogram . A seismogram is a paper record of the seismic waves the seismograph received. Seismographs have a weighted pen suspended from a stationary frame. A drum of paper is attached to the ground. As the ground shakes in an earthquake, the pen remains stationary but the drum moves beneath it. This creates the squiggly lines that make up a seismogram ( Figure below ). Choices: - transmitter - odometer - topometer - seismograph A:

Ans:seismograph

Q: What is the term for when gravity pulls soil, mud, and rocks down cliffs and hillsides? Read this paragraph and choose the correct option from the provided answers: Gravity can pull soil, mud, and rocks down cliffs and hillsides. This is called mass movement. The most destructive types of mass movement are landslides and mudslides. They occur suddenly and without warming. They engulf everything in their path. Choices: - mass pressure - avalanche - mass momentum - mass movement A:
mass movement