A) Forms fewer ATP molecules than cellular respiration.
It usually forms 2ATP as opposed to 38ATP formed during cellular respiration.
The answer is 150,000,000 years (150 million years)
Let's first convert 7,500 km to cm:
1 km = 100,000 cm
7,500 km = 7,500 · 1 km = 7,500 · 100,000 cm = 750,000,000 cm
Now, it is known that the plate is spreading at 5 cm per 1 year. Make a proportion:
5 cm : 1 year = 750,000,000 cm : x
x = 750,000,000 cm · 1 year ÷ 5 cm = 150,000,000 years
Humans have a density close to 1000 kg/m³ (the density of water). If a human has a mass of 75 kg, the volume would be around 0.075 m³.
Just like an assembly line, the human digestive system has different jobs that have to be done in order for the nutrients and such to be distributed properly throughout the body.