We carried out the disappearing cross test with sodium thiosulphate and hydrochloric acid at temperatures between 24 degrees celcius and 60 celcius.

We measured our speed using the formula:

speed = distance/time

we measured our speed in metres per second.

Selective breeding, or artificial selection is used by plant growers and animal breeders to produce organisms with the characteristics they desire. This could be more meat or more milk for example if the animal is a cow. We looked at the video of the belgian blue cow.

http://griggans.edublogs.org/2007/03/27/animal-farm/

http://griggans.edublogs.org/2007/03/29/natural-selection/

http://www.bbc.co.uk/schools/ks3bitesize/science/biology/variation_4.shtml