Q: Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: Brain cells begin to die as soon as the heart stops pumping oxygen. Given the two facts above, what can cut off the oxygen to cells? | OPTIONS:
- Sulfur dioxide
- oxygen atoms
- the heart stopping
- massive damage
- smoking pipes
- water
- hair
- cigarettes
A: the heart stopping

Q: Fact 1: Centrioles are organelles involved in cell division. Fact 2: Centrioles come in pairs. Given the two facts above, organelles involved in cell division come in what groups? | OPTIONS:
- plants
- Groups of five
- Pairs
- complex
- Groups of four
- Groups of three
- rings
- three
A: Pairs

Q: Fact 1: Polyps usually reproduce asexually. Fact 2: Plants with Asexual Reproduction Plants with asexual reproduction have no gamete fusion. Given the two facts above, polyps do not use:? | OPTIONS:
- visible energy
- an organism's body
- gamete fusion
- Pesticides
- Electrical energy
- heat or cold
- harmful substances
- heat energy
A: gamete fusion

Q: Fact 1: DNA is found in chromosomes. Fact 2: Chromosomes are located in the nucleus of a cell. Given the two facts above, dNA is found where in a cell? | OPTIONS:
- mitochondria
- complex
- alveoli
- membrane
- plants
- infected
- cytoplasm
- nucleus
A: nucleus