6. The variable that a scientist changes on purpose to test a hypothesis is the A. control variable
C. standard variable
B. independent variable
D. dependent variable
7. Which of the following is a quantitative observation?
A. The green grass was cut today.
C. There are only five cookies left in the jar.
B. Sammy has a thermometer.
D. She washed the dishes with liquid soap.
8. "Does the type of soil affect the growth of a plant?"

Can someone help me please I don’t know it help ?

Listenbase your answer to the question on the information below. nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body. cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment. which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61