The Earth is closest to the Sun, or at the Perihelion, about two weeks after the December Solstice, when it is winter in the Northern Hemisphere. Conversely, the Earth is farthest away from the Sun, at the Aphelion point, two weeks after the June Solstice, when the Northern Hemisphere is enjoying warm summer months.
Mitochondria are essential components of nearly all cells in the body. These organelles are the powerhouses for cells, providing energy to carry out biochemical reactions and other cellular processes.Mitochondria make energy for cells from the chemical energy stored in the food we eat.itochondria are essential components of nearly all cells in the body. These organelles are the powerhouses for cells, providing energy to carry out biochemical reactions and other cellular processes.
The Cell Nucleus. The cell nucleus is one of the largest organelles found in cells and also plays an important biological role. It composes about 10% of the total volume of the cell and is found near the center of eukaryotic cells. Its importance lies in its function as a storage site for DNA, our genetic material.