Has been increasing since we started the population
1a. Pseudopodia means false feet these are irregular projections found in organisms like amoeba,they help the organism in locomotion capture food etc
1b.a good vacuole is a membrane-enclosed cell vacuole with a digestive system,containing material taken up in by the process of phagocytosis.these are found in amoeba,Protozoa,paramecium
2.the ingestion of bacteria or other material by phagocytes and amoeboid protozoans (wasn’t sure for this one so I had to research)
3.amoeba takes in nutrition by the process called phagocytosis.in this process,a solid food particle is first surrounded by pseudopodia (cytoplasmic filled projection of cell membrane) and forms a vacuole called as Phagosome
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Your question isn't the most clear, but I think your answer is rocks, or more specifically phosphorous rich rocks because the phosphorous will mix with the sediments on the river's/lake's ground forming phosphorous rich rocks.
That means that It'll become a phosphate mineral and later become phosphorous again when the minerals weather.
Hope it helped,
BioTeacher101