Answer:
The correct answer is A. a rotating cloud of dust and gas.
Explanation:
Nebulae are regions of the interstellar medium (clouds) made up of gases (mainly hydrogen and helium) and dust. In other words, nebulae are concentrations of gas in which we find hydrogen, helium and stardust in greater quantities. They are structures that are actually very important for the universe, this because inside it is the place where stars are born, which arise due to the condensation and aggregation of matter. The nebular theory states that the Solar System reached the form current from a solar nebula (a gas cloud), more than 4.5 billion years ago. The large cloud of molecular gas was affected by a certain phenomenon that would have taken place in the vicinity. Like the explosion of a supernova or the passage of a star that would produce a strong gravitational impact. The result of this event made the matter agglomerate in different places. The high concentration of matter caused the nebula to collapse. Becoming a protostar, (bodies whose characteristic is to be surrounded by clouds and contain preplanetary matter inside), that is, gaseous matter in the outermost part and solid inward. At the core of this structure, the temperature is so dominant that nuclear reactions take place to compensate for the gravitational force. This leads to a hydrostatic equilibrium and the formation of a fundamental star: the Sun. The rest of the mass flattened, forming a protoplanetary disk where the protoplanets were being formed, which would evolve to become the current planets, their satellites and the others bodies of the solar system.
Answer:
An allele is a variant form of an gene that arises by mutation
they need energy because growth is not the only life process that requires energy.Apart from growth, when organism reaches adulthood they need energy to aid in other processes such as locomotion,reproduction. More also, important functions such as cell replacement requires energy.
Generic diversity for means the division of something like a generic division of a plant or of a group of humans separating them by either ethnicity, age and poverty levels. Generic variation is more a mix of something other than dividing it.
A good example of generic variation is me mixing pennies, nickels and dimes all together in one hand. You are mixing all the coins in one hand and they are all someway or another; different.
Generic diversity in the other hand is separating the pennies, nickels and dimes and classifying by there values and worth. You never mix them together in this case, you keep them separated.
Answer:
Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic, which do not. Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular.
Explanation: