-- Perihelion . . . Point in Earth's orbit where we're closest to the sun.
We get there sometime during the first few days of January.
-- Aphelion . . . Point in Earth's orbit where we're farthest from the sun.
We get there sometime during the first few days of July.
-- Perigee . . . Point in the orbit of the Moon or any artificial satellite
where it's closest to the Earth.
-- Apogee . . . Point in the orbit of the Moon or any artificial satellite
where it's farthest from the Earth.
The correct probability for this problem would be 1/4.
A balanced (self sustaining) ecosystem! Hope this helps!
B. essential
We cannot store up amino acids on our body, but we can have amino acids through consumption of food. These amino acids of which the body cannot make is called as essential amino acids.