user: *Question*
Q: Prokaryotes are successful because of the ________ of reproduction in favorable environments   Read this paragraph and choose the correct option from the provided answers:     Choices:  - order  - cycle  - volume  - speed   A:
**Answer**
speed

*Question*
Q: What is produced by leydig cells in the embryonic testis and stimulates the development of male sexual organs?   Read this paragraph and choose the correct option from the provided answers:  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 (Müllerian) 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.   Choices:  - androgen  - insulin  - estrogen  - testosterone   A:
**Answer**
testosterone

*Question*
Q: What is the movement of muscle in the digestive system called?   Read this paragraph and choose the correct option from the provided answers:  The organs of the digestive system are lined with muscles. The muscles contract, or tighten, to push food through the system ( Figure below ). The muscles contract in waves. The waves pass through the digestive system like waves through a slinky. This movement of muscle contractions is called peristalsis . Without peristalsis, food would not be able to move through the digestive system. Peristalsis is an involuntary process, which means that it occurs without your conscious control.   Choices:  - acid reflux  - labor contractions  - apoptosis  - peristalsis   A:
**Answer**
peristalsis

*Question*
Q: A _______ of biology is a fundamental concept that is just as true for a bee or a sunflower as it is for us.   Read this paragraph and choose the correct option from the provided answers:  The word principle can be defined as "a fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning. " A principle of biology is a fundamental concept that is just as true for a bee or a sunflower as it is for us. All life, including that sunflower and bee, is made of at least one cell. The traits of a particular organism are embedded within its genes, that organism must maintain homeostasis to survive, and that organism has evolved from previously existing species.   Choices:  - hypothesis  - theory  - notion  - principle   A:
**Answer**


assistant: principle