Organisms in an ecosystem must _ for resources such as water, sunlight, and food. Because of competition,_
may be limited or depleted in an ecosystem.
_factors include water, light and quality of soil. _density can lead to
depletion.

petroleum? coal maybe?

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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 appl

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".