Answer:
The correct answer is 4.6 percent.
Explanation:
The Oort cloud refers to the clouds of icy objects, which is present in the outermost section of the solar system. These are the disperse layer of clouds found in the external layer of the solar system.
In the given question, it is given that the number of comets in the Oort cloud is 10^12 comets.
The number of comets getting close towards the Sun is 10 comets in a year.
The age of the solar system is 4.6 * 10^9 years
The number of comets used since the start of the solar system is,
(4.6 * 10^9 years) (10 comets/year)
= 46 * 10^9 comets
Thus, the number of comets disappeared since the beginning of the solar system is 46 * 10^9 comets.
The initial number of comets at the start of the solar system is 10^12 comets.
The percentage of comets that are used up are:
(change in no of comets) / (initial no of comets) % = (46 * 10^9 comets) / (10^12 comets) * 100
= 4.6 percent.
C
Photosynthesis is divided into light-phase and the dark-phase. The former occurs in the presence of sunlight while the latter is independent of sunlight.
Explanation:
The light-dependent phase begins the process of photosynthesis. The energy of the sun is used to split a water molecule into H+ and O- in a process called photolysis. IN the process, two high energy electrons are released and used to replace the ones that left the reaction system of the chlorophyll pigments. The electrons being replaced were conveyed through a protein chain and their energy used to pump H+ ions into the thylakoid from the stroma. The electrons are ultimately used to reduce NADP+ into NADPH. This creates a proton motive force used by ATP synthase to create ATPs – a process called photophosphorylation.
IN the light-independent phase, carbon dioxide is reduced by NADPH to create glucose molecules in the Calvin cycle.
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Centeral nervous system includes the brain and spinal cord while the peripheral includes nerves that branch out
Answer:
Emphysema
Explanation:
You get it from airborne stuff like smoke I'm pretty sure.
