Which of the following best describes how levees impact wetlands?
a.
levees protect wetlands from destructive river floods.
b.
levees promote healthy wetland formation.
c.
levees prevent rivers from adding their sediment to wetlands.
d.
none of the above.

According to the theory of punctuated equilibrium, at what rate does speciation occur? species change depending on the rate of natural selection. after periods of stasis, new species evolve relatively rapidly. species change slowly and eventually form new species. some species change quickly and others change slowly to balance the overall rate.

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

What would be an example of hypothesis for goldfish respiration lab