Place the following events in the order in which they occurred on the vertical timeline. The first event and the last event have already been entered on the timeline.

1.Oceans contain organic molecules
2.
3.
4.
5.
6.
7.
8.Eukaryotes develop

Choices:
Organisms use photosynthesis
Ozone layer develops
Complex organic molecules form
Organisms use chemosynthesis
Protocells develop
Prokaryotes appear

1) Oceans contain simple organic molecules

2) Complex organic molecules form

3) Protocells develop

4) Prokaryotes develop

5) Organisms use chemosynthesis

6) Organisms use photosynthesis

7) Ozone layer develops

8) Eukaryotes develop

Explanation:

The early conditions of the Earth were not favorable for the support of life on it. Gradually, the Earth cooled down and inorganic gases and organic molecules started constituting the Earth.The organic molecules such as complex lipids gave rise to the protocell. The evolution of the protocells gave rise to the prokaryotes. Scientific hypothesis have claimed that the first type of metabolism that took place on the Earth was in the form of chemosynthesis.The processes of cellular respiration as well as photosynthesis evolved after chemosynthesis.The development of metabolic processes caused more gases to be formed and the ozone layer to be built.The building of the ozone layer provided stable conditions for the Eukaryotes to develop and survive on the Earth.

Science27 of the most iconic, jaw-dropping photos of the earth and the moon from spacedave mosher  oct 1, 2018, 11: 13 am etnasa/flickrapollo 11 astronauts took this photo of earth on july 20, 1969.from the ground, earth looks like a boundless fertile plain that beckons to be explored and exploited.but astronauts would beg -  and even plead  - to differ."you realize that people often say, 'i hope to go to heaven when i die,'" jim lovell, an astronaut who flew on the apollo 8 and apollo 13 missions to the moon, previously  told business insider. "in reality, if you think about it, you go to heaven when you're born."lovell has seen first-hand that we live on a tiny rock hopelessly lost in the void. he's also quick to tell you it's the only one we've got - a  fragile spaceship  for more than 7 billion people: "you arrive on a planet that has the proper mass, has the gravity to contain water and an atmosphere, which are the very essentials for life. and you arrive on this planet that's orbiting a star just at the right distance - not too far to be too cold, or too close to be too hot - and just at the right distance to absorb that star's energy and then, with that energy, cause life to evolve here in the first place. in reality, you know, god has really given us a stage, just looking at where we were around the moon, a stage on which we perform. and how that play turns out is up to us, i guess."humanity has recorded photos of earth from hundreds, thousands, millions, and even billions of miles away, some of them taken by lovell himself.these images not only scientists study our dynamic world, but also understand how a habitable planet looks from afar, which aids the search for  more worlds. most importantly, however, the images underscore our peculiar existence on  a mote of cosmic dust.take a moment to ponder 27 of the most arresting images of earth that humankind has ever captured from space.a