Q: Just under their skin, marine mammals have a very thick layer of insulating fat called what? Choices: - tissue - lipisomes - cellulose - blubber A:
blubber

Q: What term describes an imbalance of attractive forces between liquid molecules at the surface of a liquid? Choices: - currents tension - molecular tension - obsolute tension - surface tension A:
surface tension

Q: What has a bigger impact on water quality, natural events or human activity? Choices: - water quality - all of the above - natural events - human activity A:
human activity