Answer the following question given this paragraph: Opposite charges attract and like charges repulse. Q: Opposite charges attract and like charges do what? Choices: - nothing - rebound - impede - repulse A:
repulse
Answer the following question given this paragraph: In an earthquake, seismic waves are generated by rock displacement. Q: During an earthquake what causes seismic waves? Choices: - Currents - low tide - high winds - rock displacement A:
rock displacement
Q: Answer the following question given this paragraph: A common method of producing charge in the lab is to rub cat or rabbit fur against stiff rubber, producing a negative charge on the rubber rod. If you hold a rubber rod on one end and rub only the tip of the other end with a fur, you will find that only the tip becomes charged. The electrons you add to the tip of the rod remain where you put them instead of moving around on the rod. Rubber is an insulator. Insulators are substances that do not allow electrons to move through them. Glass, dry wood, most plastics, cloth, and dry air are common insulators. Materials that allow electrons to flow freely are called conductors. Metals have at least one electron that can move around freely, and all metals are conductors. Q: Rubber is an example of what type of substances that do not allow electrons to move through them? Choices: - conductor - semi-conductor - solids - insulators A:
A: insulators
Question: Answer the following question given this paragraph: Momentum is a vector quantity that has the same direction as the velocity of the object. Q: Momentum is a vector quantity that has the same direction as what? Choices: - object energy - initial speed - inertia - object ' s velocity A:
Answer: object ' s velocity
*Question*
Answer the following question given this paragraph: Sperm are released from the body during ejaculation . Ejaculation occurs when muscle contractions propel sperm from the epididymis. The sperm are forced through the ducts and out of the body through the urethra. As sperm travel through the ducts, they mix with fluids from the glands to form semen. Hundreds of millions of sperm are released with each ejaculation. Q: What is released from the body during ejaculation? Choices: - saliva - urine - blood - sperm A:
**Answer**
sperm
(Question)
Answer the following question given this paragraph: 27.3 Development of the Male and Female Reproductive Systems The reproductive systems of males and females begin to develop soon after conception. A gene on the male's Y chromosome called SRY is critical in stimulating a cascade of events that simultaneously stimulate testis development and repress the development of female structures. Testosterone produced by Leydig cells in the embryonic testis stimulates the development of male sexual organs. If testosterone is not present, female sexual organs will develop. Whereas the gonads and some other reproductive tissues are considered bipotential, the tissue that forms the internal reproductive structures stems from ducts that will develop into only male (Wolffian) or female (Mullerian) structures. To be able to reproduce as an adult, one of these systems must develop properly and the other must degrade. Further development of the reproductive systems occurs at puberty. The initiation of the changes that occur in puberty is the result of a decrease in sensitivity to negative feedback in the hypothalamus and pituitary gland, and an increase in sensitivity of the gonads to FSH and LH stimulation. These changes lead to increases in either estrogen or testosterone, in female and male adolescents, respectively. The increase in sex steroid hormones leads to maturation of the gonads and other reproductive organs. The initiation of spermatogenesis begins in boys, and girls begin ovulating and menstruating. Increases in sex steroid hormones also lead to the development of secondary sex characteristics such as breast development in girls and facial hair and larynx growth in boys. Q: What is produced by leydig cells in the embryonic testis and stimulates the development of male sexual organs? Choices: - androgen - insulin - estrogen - testosterone A:
(Answer)
testosterone