AP BIOLOGY

Detailed explanation-1: -1. Water. Almost all the processes that make up life on Earth can be broken down into chemical reactions-and most of those reactions require a liquid to break down substances so they can move and interact freely. Liquid water is an essential requirement for life on Earth because it functions as a solvent.

Detailed explanation-2: -To evolve into a habitable planet, co-existence of atmosphere, ocean, and landmass with a driving force (Sun) is one of the most critical condition.

Detailed explanation-3: -On Earth, water is the solvent critical to life without which organisms cannot survive. Its presence is so critical, because water provides an environment allowing some chemical bonds to be stable and to maintain macromolecular structure, while at the same time assisting in the dissociation of other chemical bonds.

Detailed explanation-4: -Big Ideas: Living things on Earth all need things like water, food, and shelter. Learning about life on Earth helps us learn more about other places that might have life too.

Detailed explanation-5: -Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth’s biodiversity greatly increased.