The is a natural process necessary for life on earth; however like increase this effect and result in increased global temperatures.

The words are "greenhouse effect", "greenhouse gas" and "carbon dioxide".

Greenhouse effect is a natural process, is where the greenhouse gas in atmosphere will reabsorb some of the energy from sunlight and reflect them back to earth surface in order to keep the earth warm and suitable for lives.

However, the real problem is where greenhouse gas in the atmosphere is increasing. Examples of greenhouse gas are such as carbon dioxide, nitrous oxide, methane etc. The more these has exist in the atmosphere, the more sunlight them reabsorb. This reduces the amount of sunlight radiating back to space and leads to global warming.

A) Cytochrome C reduction in healthy cells B) Cytochrome cause the oligomerization of APAF1 that cause the activation of Caspase-9, which activates the Caspase-3 and Caspase-7 that ultimately lead to apoptosis.

Explanation:

Apoptosis is the programmed cell death which is performed to get rid of unnecessary and damaged cells through biochemical changes in higher animals. In apoptosis the cell shrinks, cytoskeleton collapse, nuclear membrane disassemble and DNA break into fragments.

a) Cytochrome C is present in intermembranel spaces of mitochondaria and the heme group of cytochrome C accepts electrons from Complex bc1 and transferr to complex IV. Thus as the healthy cells requires proper energy to perform its regular functions the cytochrome keep reducing rapidly in it and this inhibit the cytochrome to initiate the apoptosis in healthy cell.

B) Cytochrome C is released from mitochondria in apoptotic cell and it cause the oligomerization of the inactive Apoptosis protease activating factor-1. It form apoptosome complex with APAF1 that initiate and activate the caspases. These caspases are then involved in degradation of protein.