Describes how efficiency of cellular respiration and production of carbohydrates through photosynthesis as well as oxygen has benefitted society. explain how the earth would appear if endosymbiosis hadn’t occurred.

Cellular respiration is the process by which cells convert glucose into energy in the form of ATP. The process of aerobic respiration produces huge amount of ATP from each sugar molecule. Aerobic respiration takes place  in eukaryotes.   The reactions involved in the respiration are catabolic reactions. From the complete oxidation of one glucose molecule to carbon dioxide and oxidation of all reduced coenzymes. It  generates 30-32 ATP in each cycle and used by plants, animals and humans therefore  it is highly efficient and beneficial for the society. Without photosynthesis plants will not have carbohydrates for respiration.  

Endosymbiosis is the hypothesis which says that prokaryotes gave rise to the first eukaryotic cell. It explains the origin of eukaryotic cell organelles such as mitochondria in animals and fungi and chloroplast in plants have evolved from prokaryotes like mitochondria has evolved from proteobacteria and chloroplast from cynobacteria. It simply defines that primitive simple organisms evolved in order to develop as  complex organisms. If endosymbiosis had not occurred on earth than there would be no diversity in life forms on earth.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .