Answer:
Humans are one of the important contributor for CO2 (Carbon Dioxide) Production. In our body, carbon dioxide is formed intracellularly as a byproduct of metabolism. Carbon Dioxide is transported in the bloodstream to the lungs where it is ultimately removed from the body through exhalation. This process is called Respiration generally Cellular Respiration.
And in Photosynthesis, the exhaled CO2 from human body ( or any other living organisms) are being used as the reactant (with the H2O) then produces Glucose (energy source of plants) and Oxygen (living organisms need to survive). This process takes place in chloroplasts, which contain the chlorophyll.
To sum up, carbon cycle is the process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food. Animals then eat the food and carbon is stored in their bodies or released as CO2 through respiration.
Therefore, without living organisms there are no carbon dioxide, oxygen and other gases will be produce same as without non-living organisms like gases, the sun, water and etc. human race and other organisms can't survive. And there will be no ecosystem.
<span>The cells that are on each side of the stomatal pore and open and close
it like a mouth is called <u>guard cells</u>. Guard cells are found almost all
over the body part of the plant. The opening and closing of the stomata acts as
a mediator by changes in turgor pressure of the guard cells. Turgor pressure
pushes and sometimes out of the cell wall of the plant to allow ions of
solution to come in and out. The stomatal pore of the guard cell becomes large
when water is present around it and it is small when water is not present. </span>
The independent variable is the new plant food
The cross would be: BB × Bb
Results will be: 2 BB & 2 Bb
so, it's genotypic ratio = 1:1
Phenotypic ratio = 1:0
Hope this helps!