What vocabulary word would mean A species that the other species in an ecosystem largely depend. such that if were removed the ecosystem would change drastically

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

The activity of the modern sample is 1.10 bq . how long does that measurement take?

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations