This review discusses the possible microbial habitability on Mars, assuming variable conditions and ingredients favoring life on Mars. Westall et al (2013) analysed certain considerations to hypothesize that the potential emergence of life on Mars over time was not constant. There have been mineralogical and geological evidence supporting the availability of water and as discussed, there may have been possible routes where martian habitability could have flourished. Although there is adequately enough evidence signifying this concept, the study revealed the delicacy in concluding that certain elements and evidence relating to the habitability on Mars would have been in fact heterogeneous throughout its history. This hypothesis provides perceptions into the importance of assessing the habitability of Mars, impacting on the nature and conditions of life which will be critically discussed to support the liberation of heterogeneous conditions on Mars.

Westall begins the articles discussing the theory that the appearance of water accelerates the introduction of life. However, he stresses the fact that from a microbial point of view, habitability can be very liable and misleading when assessing the conditions on Mars. A habitable zone can be defined as a rocky planet that can maintain liquid water on its surface (Kasting et al 2013). The importance here in this definition is the maintenance of water on a rocky planet. Westall made valid points when assessing the possible appearance of liquid water on Mars. He discourses the fact that loss of early atmosphere as well as the extreme weathering conditions, transported the availability of water into various poles and sediments, making it insufficient for life to flourish for the appropriate amount of time. Further evidence investigated by Mangold et al (2007) and Jakosky and Shock (1998), note the short lived aqueous