Ascientist wants to determine which fertilizer is more effective—fertilizer x or fertilizer y.
the best way for her to proceed would be to design an experiment with
a.
three groups of plants—a group fertilized by x, a group fertilized by y, and a control
group with no fertilizer.
b. two groups of plants—a group fertilized by x and a control group with no fertilizer.
c. two groups of plants—a group fertilized by y and a control group with no fertilizer.

How are viruses and bacteria different?

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Afor ram b for pats super bowl pick one