What type of diversity present in the external characters of the plants ?
Answers
Answer:
Poor miserable Robinson Crusoe, being shipwrecked during a dreadful storm in the offing, came on shore on this dismal, unfortunate island, which I called “The Island of Despair”; all the rest of the ship's company being drowned, and myself almost dead.
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Answer:
I hope it's look easy to you
Explanation:
In order to explain the observed diversity of planetary system architectures and relate this
primordial diversity to the initial properties of the discs where they were born, we develop a
semi-analytical model for computing planetary system formation. The model is based on the
core instability model for the gas accretion of the embryos and the oligarchic growth regime
for the accretion of the solid cores. Two regimes of planetary migration are also included. With
this model, we consider different initial conditions based on recent results of protoplanetary
disc observations to generate a variety of planetary systems. These systems are analysed
statistically, exploring the importance of several factors that define the planetary system birth
environment. We explore the relevance of the mass and size of the disc, metallicity, mass of
the central star and time-scale of gaseous disc dissipation in defining the architecture of the
planetary system. We also test different values of some key parameters of our model to find out
which factors best reproduce the diverse sample of observed planetary systems. We assume
different migration rates and initial disc profiles, in the context of a surface density profile
motivated by similarity solutions. According to this, and based on recent protoplanetary disc
observational data, we predict which systems are the most common in the solar neighbourhood.
We intend to unveil whether our Solar system is a rarity or whether more planetary systems
like our own are expected to be found in the near future. We also analyse which is the more
favourable environment for the formation of habitable planets. Our results show that planetary
systems with only terrestrial planets are the most common, being the only planetary systems
formed when considering low-metallicity discs, which also represent the best environment for
the development of rocky, potentially habitable planets. We also found that planetary systems
like our own are not rare in the solar neighbourhood, its formation being favoured in massive
discs where there is not a large accumulation of solids in the inner region of the disc. Regarding
the planetary systems that harbour hot and warm Jupiter planets, we found that these systems
are born in very massive, metal-rich discs. Also a fast migration rate is required in order to
form these systems. According to our results, most of the hot and warm Jupiter systems are
composed of only one giant planet, which is also shown by the current observational data.