Which sentence uses commas correctly? when the sun is out, days in the desert can be very hot and, i think, many animals sleep in burrows or under rocks to stay out of the heat. when the sun is out, days in the desert can be very hot, and, i think, many animals sleep in burrows or under rocks to stay out of the heat. when the sun is out days in the desert can be very hot, and, i think, many animals sleep in burrows or under rocks to stay out of the heat. when the sun is out, days in the desert can be very hot, and i think many animals sleep in burrows or under rocks to stay out of the heat.