Scientists find the same type of index fossil in two different locations on earth. what can they conclude from this discovery? a. the fossils are different ages due to the location. b. the index fossils are the same geological age. c. one index fossil is older than the other. d. there is not enough information to make a conclusion.

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?