Which example involves a cell membrane receiving and sending messages?
a. a transport protein allows glucose to enter a cell
b. a fox chases a mouse through the forest
c. a cell tells other cells that danger is near
d. a cell membrane allows water to enter the cell

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

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

What’s the student’s scientific question