What must scientists look for in their experiment or their data to make sure it is accurate? A. Sources of error B. Observations C. Hypotheses D. Dependent variables

Use the drop-down menu to complete the statement. an electron in the first energy level of the electron cloud has an electron in the third energy level.a. a lower energy thanb. a higher energy thanc. the same energy as

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above