B because B is the nucleus which is the storage location of DNA
Because they play important roles in the environment, take the food chain for example. animals continuously convert energy all the way up until a human eats. also, decomposers are important too because the return nutrients to the ground, like mushroom, fungi, and bacteria
The heart is a vital organ, and its functioning is essential to life.
All your other organs may fail, and you will still be alive. Even if your brain stops working, and your heart is healthy, you will be alive in the vegetative state where you won't be conscious at all. However, once your heart stops working, you die, which means it is the most important organ in your body.
It’s the doctor of all systems
Carbohydrates, they break down easily
