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.