I would say,
Aa.
Please mark brainlist.
And sorry for the user below ..☺☻
A manifestation of local blood flow regulation.
If a particular job of a cell was to swim a long distance to an egg with a flagella, then it would need more mitochondria. As mitochondria undergo cellular respiration and essentially utilize the carbohydrates for that particular cell to produce the final product of ATP high energy containing molecules needed for the movement.
Earth's atmosphere helps maintain a constant temperature.