If there are no multiple choices then i just thonk he should quit
Circadian rhythms are biological changes that occur on a 24 hour cycle. The correct option among all the options that are given in the question is the last option or the fourth option. This is the type of system that happens in plants, animals, cyanobacteria and fungi. I hope the answer comes to your help.
The picture isn't showing up, but I'm sure it's fine!
The answer is 20 minutes. You must have 20 minutes of cardio each day to have an effective cardio exercise.
Breathing, and lungs. They are the most important.
