16. Which of the following does
NOT include asexual
reproduction?
A.grafting of lemons
B.spore formation of ferns
C.zygote formation of moss
D.new plants arise from the
nodes of rhizomes of ginger

17.An environmental study reporting on the way temperature water quality and minerals affect the groups animals in a salt marsh would be considering which level of organization?
A.community
B.ecosystem
C.organism
D.population

18.Which is biotic factor that affects the size of a population in a specific ecosystem?
A.type of soil in the ecosystem
B.average temperature of the ecosystem
C.concentration of oxygen in the ecosystem
D.number and kinds of predators in the ecosystem

19.Overfishing of large predatory fish has left a stream free of many predators.This will result in the stream ecosystem having a
A.increase in prey fish
B.decrease in prey fish
C.decrease in pollutants
D.increase in aquatic plants.​