Primary succession occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier
Answer:
4. p.complement system c.saliva b.sneezing
The choices can be found elsewhere and as follows:
<span>atural and synthetic
metabolites and nonmetabolites
proteins, carbohydrates, lipids, and nucleic acids
organic compounds and inorganic compounds
I think the correct answer from the choices is the third option. The c</span>lassifications of matter used In the 1800 are proteins, carbohydrates, lipids, and nucleic acids. Hope this helps.
Rose bush because not many animals eat rose bushes
