Answer:
You, a human being and a pet share a mutualistic relationship. A mutualistic relationship is a relationship in which two different species of organisms benefit each other. You and your pet have a mutualistic relationship because a pet provides companionship, comfort, in some cases protection (depending on the pet), and protecting your home from rodents (also depending on the pet). While animals provide these services for humans, in return we provide food, water, shelter, and love/comfort for the animal. Both organisms (you and your pet) benefit from your relationship therefore it is mutualistic.
Metres are exactly 100 cm in length, the easiest way to go from metres to centimetres is to simply add the extra 1 or 2 zeros, so 4.5 metres would be 450 centimetres.
As for the millimetres, 1mm is equal to 0.1cm, once again, just move the decimal forward by one numeral, and you'll have the converted value, making 50mm = 5.0cm.
Your shark would be 450cm long and have teeth with an average length of 5cm.
An example could be office personnels,
1. The nucleus could be the CEO of the company
2. The chromosomes could be the knowledge workers of the company or the managers since these are the people that can shape the company and aid the formation of culture and organization -assisting the CEO.
3. Mitochrondria could be the workers since they power up the company, without them there would be no team, firm or the company itself.
4. Golgi body can be the secretaries or the assisting managers which supports, checks, modifies and confirms the many tasks before it is passed into the nucleus and other organelles, they also dissiminate information.