What information should I put for the other two reasons?

1. When the Earth is closer to the sun it receives more heat than when it is further from the sun. But this orbital shape changes over time, affecting the Earth's overall climate situation. This variation is known as eccentricity and it changes over a period of about 100,000 years

2. The movement of the Earth around the Sun combined with the tilt of the Earth's axis causes weather, seasons and climate. The Sun causes weather patterns and the long-term average of weather patterns creates climatic zones around the world. The combined average regional climates create the Earth's climate.

1. is through mitosis2.dna replication

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.