Respuesta :
Answer:
In the beginning, the earth was without form, and void; and darkness was upon the face of the deep, as a giant cloud of gas and dust collapsed to form our solar system. The planets were forged as the nebula spun, jolted into motion by a nearby supernova, and in the center, the most rapid compression of particles ignited to become our sun. Around 4.5 billion years ago, a molten earth began to cool. Violent collisions with comets and asteroids brought the fluid of life - water - and the clouds and oceans began to take shape. It wasn't until a billion years later that the first life was brought forth, filling the atmosphere with oxygen.
Explanation:
Over the next few billion years, single-celled organisms fused and became multicellular; body plans diversified and radiated, exploding into an array of invertebrates. Yet all this abundance and life was restricted to the seas, and a vast and bountiful land sat unused. Around 530 million years ago, there is evidence that centipede-like animals began to explore the world above water. Somewhere around 430 million years ago, plants and colonized the bare earth, creating a land rich in food and resources, while fish evolved from ancestral vertebrates in the sea. It was another 30 million years before those prehistoric fish crawled out of the water and began the evolutionary lineage we sit atop today. To understand life as we know it, we have to look back at where we came from, and understand how our ancestors braved a brand new world above the waves.
Organisms moving to land needed the ability to adapt to a complete new environment. On land there isn’t a constant source of food unless it’s plants so animals had to adapt to eat new foods. Animals also had to be able to stay wet or live without needed to breath water. This led to lungs. Most importantly animals need to be able to move on land which is very hard with aquatic appendages. This led to organisms needed to adapt to climate, terrain, and nutrition source.
