Which of the following hypotheses is best supported by observing cancer cells in a culture a. the cancer cells do not exhibit density dependent inhabition b. the cancer cells produce molecules that inhibit the growth factors reguired for cell division c. the cancer cells spend the majority of their time in the g0 phase d. the cancer cells exhibit anchorage dependence

Which table best shows the impacts resulting from human activity? impact of human activities human activity impact forest area cleared to construct an airport increase in oxygen level vegetation cleared to construct an oil mine increase in pollution impact of human activities human activity impact forest area cleared to construct an airport increase in sound pollution vegetation cleared to construct a power plant contamination of water impact of human activities human activity impact beehives cleared from urban areas increase in vegetation dams constructed on a river increase in fish population impact of human activities human activity impact beehives cleared from urban areas increase in bird population dams constructed on a river better quality of water

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the: