Which statement is true about two atoms of carbon that have the same number of neutrons?   a. they are the same isotope.   b. they have a different number of protons.   c. they have different number of neutrons.   d. their atomic numbers are different.

Need ! will give 20 points! what are two ways that diatoms differ from slime molds? the external coverings of diatoms are made up of (silica, chitin or peptidoglycan), while slime molds have cell walls containing (silica, peptidoglycan or chitin). diatoms are (chemoheterotrophs, photoautotrophs or chemoautotrophs) because they make food through photosynthesis, while slime molds are (heterotrophs, phototrophs or autotrophs) because they eat decaying plant matter.