A scientist conducts an experiment to determine the safety of a potentially toxic substance that has been used in the production of children's toys. Why is evaluation of the experiment procedures important? A. Because other scientists will want to prove the conclusion incorrect.

B. Because an inaccurate or unreliable experiment design can result in incorrect conclusions.

C. Because the companies producing the toys want to make money

1) this is the structure in the cell nucleus that houses a cell's genetic information

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?