A cool trick with hot water at -40 degrees centigrade

Hi,

At around -40 degrees centigrade, water freezes immediately.

Watch this amazing demonstration.



How is it that we do not freeze too when we step outside the heated homes?
Homoeostasis is the answer. Cold blooded animals will freeze up. Warm blooded animals like us and the other mammals and of course the birds have inbuilt mechanisms to keep our body temperature constant whatever the outside temperature.
We have to get the energy from our food through the process of respiration.

Cheers

Some new exciting interactive Bio resources

Hi students,

Here are a number of sites to check out for really exciting ways to learn biology. Visit them and enjoy......

#Dr Saul's Biology in Motion, it brings biology to life.
There are a number of act ivies such as
1. one page cartoon on cells
2. animals on fat digestion and bile
3. Negative feedback
4. 3D animation to explain circulatory system
5. questions and answers exercise on mitosis and meiosis.

Go to:
http://www.biologyinmotion.com/index.html


#Cells alive, it brings quizzes, puzzles and interactive activities
1. cells models of plant and animal cells
2. mitosis
3. cell cycles
4. immunology


Go to:
http://www.cellsalive.com/howbig.htm


#BBC GCSE bitesize
It brings you a whole lot of revision, activities, tests on all biology topics
some examples are:
1. hormones
2. defending against infections
3.diet and exercise
4. nervous system
5. organisms and the environment
6. evolution
7. drugs and health

Go to:
http://www.bbc.co.uk/schools/gcsebitesize/

Regards
Mrs Graetz