The answer is d. all of the above
Curl ups and push ups test endurance because they see if your body can produce enough oxygen for you to do the exercise for long periods of time
Answer:
Explanation:
If sunspots are active, more solar flares will result creating an increase in geomagnetic storm activity for Earth. Therefore during sunspot maximums, the Earth will see an increase in the Northern and Southern Lights and a possible disruption in radio transmissions and power grids.
