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.
Treppe is the phenomenon that results in a progressive increase in the force generated with repetitive stimulation.
Answer:
I think its organic material from plants and animals
Explanation
Edge 2020
Answer:
the optimal pH for enzyme function is 6 but it can function well between a pH range of 2 to 7 which is the pH in small intestine. At highly alkaline pH the enzyme will denature.
Explanation:
They are similar a bit like this ----
It is true that the testicles are similar in shape to ovaries, but that is where those similarities end. Males do NOT start as females. All humans start out the same, asexual. When hormones are introduced during development, the s-xual organs form. If a female has too high of testosterone during development, they will be come a hermaphrodite and have what looks like both organs and same goes if males and they actually begin life as the same organ structurally anyway. That's why it's so difficult to tell the sex of a very young fetus they all have a phallus which becomes a pen-s in males and a cli-oris in females. The gonads are all internal at that time. They become ovaries in females and descend and become testicles in males.