Biological magnification of pcbs has been found in the food web of the great lakes, where the concentration of pcbs in herring gull eggs, at the top of the food web, is nearly 5,000 times that in phytoplankton, at the base of the food web.

Sarah is sitting at the top of the slide in the schools playground. which will increase sarah’s kinetic energy a- an additional child is added to the top of the slide. b- sarah is pushed and moves down the slide. c- sarah climbs down the ladder and off the slide. d- the ladder is moved to the other side of the yard.

Put the following processes of protein synthesis in the correct order: - dna strands unwind and separate - mrna copies dna according to complimentary base pairing - trna's anticodons bring amino acids to the corresponding mrna codons - amino acids bind to each other making a protein - mrna leaves the nucleus - a stop codon is reached, the newly formed protein is released to go do its job for the cell

Explain why biological control methods are generally environmentally superior to chemical pest control methods.