a student wants to test the effect of different amounts of caffeine of different amounts of caffeine on the heart rate of daphnia, a small crustacean. What is the dependent variable?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Which activity is an innate behavior

How many moles of ccl4 are in 3.55l