Sedimentation accumulation found in bodies of water can be the result of . A. Fertilizer runoff b. Pesticides and herbicides c. Erosion from agricultural practices d. All of the above.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.

Which statement correctly describes why the dna synthesis is discontinuous on one template strand while continuous on the other? (select all that apply.) a. it is due to the semiconservative nature of dna replication. b. it is due to the nature of the dna polymerase which can only add new nucleotide at the 3' end. c. it is due to difficulty in unwinding the dna template for replication. d. it is due to antiparallel nature of the dna molecule. e. it is due to the fact that the dna polymerase is not active enough.

Anew organism has been discovered. this organism has a bilaterally symmetric unsegmented body. it's capable of moving on its own with a muscular appendage and is encased in a large shell that seems to be attached to its body. based on this evidence, which phylum would this new animal likely be classified into? a. arthropoda b. echinodermata c. nematoda d. mollusca