Every cell in your body contains organelles (structures that have specific functions).Just like organs in the body each organelle contributes in its own way to helping the cell function well as a whole. The nucleus. mitochondria and chloroplasts are all organelles.
I think this will help you.
Answer:
Decomposers. I hope i am right
One of there ansestors must have had blue eyes, or might have been a genetic mutation. But it's rare to find such a random mutation. But we must keep in mind that reproduction of cells and when DNA is copied it could have a mutation. But the likely explanation would be that one of there ansestors or grand parents had blue eyes until the trait that forms brown eyes became more common in the family tree.
<span>In such conditions, oxygen was available in abundance.</span>
<span>An aloe vera plant possessing a trait for extra thick leaves survives a long drought in a desert, while an aloe vera plant that has thinner leaves does not.
The others are altered by humans and/or not in any way related to natural selection.</span>
