scientists think that dolphins and whales may have evolved from a common ancestor. what evidence supports this hypothesis?

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?