1. each sample has the same properties as every other sample in a..

a. element
b. compound
c. mixture
d. both element and compound

2. a substance made up of one type of atom is a..

a. element
b. compound
c. mixture
d. both element and compound

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.

Conservation efforts have been effective in "increasing the number of endangered species, reducing all the negative impacts of human activity, and preserving wildlife habitats".hope my answer has you : ) 

Depends on the speed of the car.