Explanation:
from the graph study about oxygen content of Earth's atmosphere, we can understand that  
1)
4 billions year ago = None, 3 billions year ago = Cyanobacteria and Archaea , 2 and 1 billions year ago = Bacteria and Green algae , 500 Ma = invertebrate fossils started to existence. Early land plants came in to existence around 398 MA that is Devonian. Dinosaurs are came in to existence during Triassic and Jurassic that is around 251 Ma. Man and animals are recent organism came under Holocene that is 11000 years ago. 
2)
The first cells on the earth are anaerobic microorganisms, as the CO2 level is too high they survive by using CO2. 
3)
Starting around 2.7 billion years ago, photosynthesis by Cyanobacteria and later plants , pumped “OXYGEN” in to the atmosphere. This caused the decline of anaerobic bacteria and allows the diversification of animals as seen in “CAMBRIAN” around 500 millions year ago.  
Early vascular plants “CAPTURED” CO2 starting before the Carboniferous period that began around 350 millions year.Leading to lower temperatures and allowing and allowing the seed plants to outcompetes seedless plants.
Modern human activities has raised both “CO2 and METHANE” level in the atmosphere to over leading to higher temperature and extinction of other species.
 
        
                    
             
        
        
        
Unfortunately, you haven't shared any data list which would make braunly users able to help you. The only thing I can suggest you is to write  the neutralization reactions, this can make you  understand the calculations more or less clearly. Please, next time check your attachments carefully.
        
             
        
        
        
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.
 
        
             
        
        
        
Gravity is the force of motion pulling down objects to the ground. If there was no gravity, everyone would walking as if they were on the moon. 
Mass is what gravity needs. If an object has a little amount of mass, gravity will be able to easily bring it to the ground. 
If an object has a very huge amount of mass, gravity will still be able to bring it to the ground but it will be hard. 
For example: An airplane has a HUGE amount of mass. Gravity pulls it down but the airplane needs to be steering up in order for it to be straight. Gravity is applied on the airplane when it is landing. 
BUT..... if a table is in the way of an object it depends if it will fall down to the ground or stay on the table. 
If an object has little mass and a table is in the way of gravity pulling it down to the ground, the object will stay on the table. Like a plate of food on a table. 
If an object has a very big amount of mass and a table is in the way of gravity pulling it to the ground, the object will break the object and make it's make to the ground. That is mostly why most of the time people have very strong tables/ anything to hold a heavy object.  
Another example is if you're lifting weights and you have little amount of mass, you're most likely to get the little sized weight. It depend on you mass. 
Here are some pictures I included here as well of Mass and gravity. 
Glad to help! :) :D 
 
        
             
        
        
        
Answer:
228 mL
Explanation:
M1*V1 = M2*V2
M1 = 6.58 M
V1 = ?
M2 = 3.00 M
V2 = 500 mL
V1 = M2*V2/M1 = 3.00M*500.mL/6.58 M = 228 mL