The plants remaining would be the only plants then will come as the animals die because they cant eat plants because all the plants are gone then will come us which we will die because there aren't any animals to thrive on
        
             
        
        
        
Answer:
62°F (17°C) to -60°F (-51°C) at the tropopause.
 
        
             
        
        
        
I believe the biggest space mission of the twenty-first century will be a manned mission to Mars, and the colonization that follows. This is the stated goal of several nations, companies, and individuals, all with considerably deep pockets. This mission will not only be a huge leap forward in space exploration, it will usher in a new era in human history in which the human race is an interplanetary civilization, a natural milestone as humanity continues to progress and advance. 
Significant challenges are many and overwhelming. In terms of getting to mars, we need efficient, powerful propulsion systems and a spaceship that can not only accommodate a full crew for a mission that would likely last years, but withstand the various hazards that a long trip through space and entrance into the Martian atmosphere will entail. In terms of colonization, significant challenges will include establishing efficient and frequent travel/transport between the planets, and in the longer term, the necessity to terraform the planet (make it more like Earth) so that humans can more easily live there. 
        
             
        
        
        
Answer:
The process which must occur when intending to work with research animals that are covered by the U.S federal regulations is ethical review and approval
Explanation:
Some animals had been threatened of extinction due to inconsiderate usage and killings due to either commercial, food, or research purpose. The U.S government, therefore, to prevent the extinction of such animals, formulated a law to restrict the engagement of these animals, even in research if the research will involve the slaughtering, injuring, or alter the physiological functions of the subject animals. Therefore, there has been needing to undergo a compulsory ethical review process when planning to undertake research. This process will objectively review the aims and objectives of the intended research, the methodology involved in achieving the aim, as stated in the research proposal. The importance of this review is to determine if the research will have deleterious effects on the animals, both spontaneously and in the future.
 
        
             
        
        
        
Two-third fraction of the carbon dioxide molecules released is generated during the citric acid cycle.
Explanation:
Aerobic respiration results in energy production as well as releases the waste products of carbon dioxide plus water. 
Pyruvate oxidation during aerobic respiration leads to the production of carbon dioxide and pyruvate is converted into a two-carbon molecule aligned with acetyl CoA. 
This compound then proceed to the citric acid cycle, oxidize, and results in the production of two carbon dioxide molecules along with one GTP or an ATP, 3 NADH, and 1 FADH molecule.  
The citric acid cycle or the tricarboxylic cycle is a set of cyclic biochemical reactions taking place in aerobic organisms to oxidize the acetate (acetyl carbon molecules of the acetyl CoA) from proteins, carbohydrates, and fats into carbon dioxide and release energy.