The atomic number of carbon is six, which means that a carbon atom has six protons carbon has three naturally occurring isotopes carbon-12,
carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that apply
a
all carbon atoms have six neutrons.
b. all carbon atoms have six protons and six electrons.
c
atoms of all carbon isotopes have either more than 6 electrons or fewer than 6 electrons.
d. atoms of some naturally occurring carbon isotopes may have six neutrons.
e
atoms of some naturally occurring carbon isotopes may have twelve neutrons.

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

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis