B1

Statins can damage organs, cause death & are for a lifetime whereas Cholesterol Cholesterol Blockers aren't. Statins reduce cholesterol more than CBs.

Statin is better for people with inhierited high cholesterol  whereas CB are better for people with dietary cholesterol problems. CBs interfere with action of other drugs whereas Statins don’t.

Using statin/CBs is better than dying from heart attack/build-up of fat in blood vessels/ reduced blood flow.

Photosynthesis removes CO₂ from atmosphere.

Green plants/animals respire, this returns CO₂ to the atmosphere.

Humans cut down & burn trees, this returns CO₂ to the atmosphere.

Animals eat green plants & store carbon in bodies.

When animals/plants die, micro-organisms decay the bodies + release CO₂ back into the atmosphere through respiration (faster when conditions are hot&moist)

Nucleus removed from an unfertilised egg cell. Nucleus removed from an adult cell and placed inside the ‘empty’ egg cellà new cell given electric shock which causes it to divideàEmbryo develops into a ball of cells and is inserted into the womb of a host mother. Embryo genetically identical to adult cell (i.e. skin cell)

Toxicity – To test whether the drug is harmful to humans. Tests are carried out on cells, tissues and animals

 Clinical trials – a small group of young healthy volunteers are given a low dose off the drug to see what happens

Further clinical trials- if are no side effects on the volunteers. And a double bind trial is carried out this is where half of the ill volunteers are given the real drug. And the other half are given a placebo. Neither the doctor nor the patients who has the real drug. Then tests are carried out to see if the drug has an effect

Approval- if the drug passes all three stages it is then approved

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