1.John has very good body co-ordination to become a free style dancer. Which system is involved in carrying out such co-ordination? 1. Nervous system

2. Muscular system

3. Respiratory system

4. Circulatoery system.

2. Adam is a national footbal player, he practices the game from 6am to 6pm and gets very limited time to rest. The muscle in his body that works without rest is the
1. Cardiac muscle.
2. Striated muscle
3. Non-straited muscle
4. Antagonistic muscle

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.

Been sitting here trying to take this test and don't know this answer! place the events of a feedback mechanism associated with body temperature in the correct order. ·nerve cells send message from skin to the brain ·body returned to normal temperature around 98.6 degrees f ·temperatures regulation center in the brain sends out signals ·body temperature exceeds 98.6 degrees f ·sweat glands throughout the body activate to cool off skin surface it is a 1 through 5 question in biology!