Q: What is a continuous flow of electric charge called? Read this paragraph and choose the correct option from the provided answers: Electric current is a continuous flow of electric charge. It is measured in amperes (A). Direct current (DC) flows in just one direction. Alternating current (AC) keeps reversing direction. Choices: - powered current - microwave current - magnetism - electric current A:
electric current

Q: What kind of reproduction, in general, relies on sets of cells that are precursors for eggs and sperm? Read this paragraph and choose the correct option from the provided answers: Choices: - binary fission - fusion - asexual - sexual A:
sexual

Q: Q: Hyperparathyroidism results from an overproduction of what? Read this paragraph and choose the correct option from the provided answers: Hyperparathyroidism results from an overproduction of parathyroid hormone. This results in excessive calcium being removed from bones and introduced into blood circulation, producing structural weakness of the bones, which can lead to deformation and fractures, plus nervous system impairment due to high blood calcium levels. Hypoparathyroidism, the underproduction of PTH, results in extremely low levels of blood calcium, which causes impaired muscle function and may result in tetany (severe sustained muscle contraction). The hormone calcitonin, which is produced by the parafollicular or C cells of the thyroid, has the opposite effect on blood calcium levels as does PTH. Calcitonin decreases blood calcium levels by inhibiting osteoclasts, stimulating osteoblasts, and stimulating calcium excretion by the kidneys. This results in calcium being added to the bones to promote structural integrity. Calcitonin is most important in children (when it stimulates bone growth), during pregnancy (when it reduces maternal bone loss), and during prolonged starvation (because it reduces bone mass loss). In healthy nonpregnant, unstarved adults, the role of calcitonin is unclear. Choices: - inhibited hormone - tharayroid hormone - elevated hormone - parathyroid hormone A:
A: parathyroid hormone

Question: Q: What is formed when the ceiling of an underground cave collapses? Read this paragraph and choose the correct option from the provided answers: As erosion by groundwater continues, the ceiling of a cave may collapse. The rock and soil above it sink into the ground. This forms a sinkhole on the surface. You can see an example of a sinkhole in Figure below . Some sinkholes are big enough to swallow vehicles and buildings. Choices: - hill - groundwater - mountain - sinkhole A:
Answer: sinkhole

*Question*
Q: Where do organisms acquire toxic substances from along with nutrients and water? Read this paragraph and choose the correct option from the provided answers: Choices: - reproduction - isolation - movement - environment A:
**Answer**
environment

Q: Q: What type of behavior has the advantage of being flexible and capable of changing to suit changing conditions? Read this paragraph and choose the correct option from the provided answers: Most animals are capable of learning, but animals that are more intelligent are better at learning and depend more on learned behaviors. The big advantage of learned behaviors over innate behaviors is that learned behaviors are flexible. They can be changed to suit changing conditions. Choices: - inherited behavior - noted behavior - saved behavior - learned behavior A:
A: learned behavior