please please send me quickly on question number 2
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ANSWER
Life exists only on Earth, as for life to exist on any other planet this planet must have right conditions for photosynthesis i-e, the planet must have water, Carbon dioxide and a suitable temperature.
There are a number of theories for how life originated on Earth, many of which try to explain how our planet got the ingredients for life: elements like carbon and nitrogen.
Previously, scientists have suggested that meteorites delivered life-giving elements to Earth. While the isotopic signatures of these elements on Earth match up with these objects, the ratio of carbon to nitrogen isn’t quite right. While the meteorites thought to have delivered elements crucial to life to Earth (known as carbonaceous chondrites) have 20 parts carbon for each part nitrogen, that ratio is about 40-1 on Earth.
Instead, these crucial elements may have been delivered in a staggering collision, says a group of petrologists at Rice University. Scientists know that a long-ago collision between the proto-Earth and a Mars-sized object created the moon — that same impactor may have also given us the elements for sparking life, they say.
To come to this conclusion, the research team created a simulation of the event based on a series of experiments that tested the behavior of carbon, nitrogen, and sulfur during the process of core formation on a rocky planet. The team then simulated the high pressures and temperatures during core formation and estimated how much carbon or nitrogen might be in a Mars-sized planet with a sulfur-rich core. They ended up with a geochemical simulation that accurately modeled observations of carbon, nitrogen and sulfur on Earth.