What is a testable explanation of or answer to a scientific question that is based on prior knowledge or research?

During which stage of a cell's cycle do the replicated chromosomes become visable?

DNA analysis is a technique that is often used in order to determine if an offspring is related to a parent. If the banding pattern in a baby shows a high correlation to a parental banding pattern, the two are most likely related.

Three-year-old Mara jumped off the couch and injured her right tibia (lower leg bone). The emergency room nurse said she "broke her cartilage." Mara's mother feels relieved that Mara didn't break her bone.

What physical health risks are directly associated with urban sprawl?

A girl walks 2 km north, then 2 km east, then 2km south, then 2km west. what distance does she travel? what is her displacement?

which object would take the most force to hold up in the air? A. a bus B. a chair C. a balloon D. a nail

In a ecological pyramid, what happens to energy, biomass and number of species as you move up? Why?

Experiment: Water Properties: Why were the results with just water so much different than the trials with the detergent?

How do fish nets effect the ocean's ecosystem?

A dog and a pig attempt to mate. we are aware that these are two different animal species. but what is the best explanation for the barrier that makes it impossible for them to successfully mate?