December 21st in the Northern because of the winter solstice. The sun reaches its most southerly declination of -23.4 degrees. In other words, it is tilted furthest away from the Sun. Therefore, there is no direct sunlight making the hours shorter. In the Southern hemisphere summer days are longer.
The only reasonable answer I can see is
D. Ectothermic animals need the warmth before they can move around to hunt food.
The rough endoplasmic reticulum has many ribosomes attached to it. Since ribosomes make proteins, and the cell's cytoplasm has large amounts of the rough ER, we can hypothesize that the cells are making large amounts of proteins.
B. 2.883 million kilometer