Why are cells generally so small? select all of the answers that apply.

a) as they grow, their volume increases faster than their surface area.

b) as they grow, their surface area increases faster than their volume.

c) moving nutrients across their cell membranes is more efficient.

d) moving waste materials across their cell membranes is more efficient.

A), C) and D)

Explanation:

It is important for the cell to maintain a high surface area: volume ratio so that the gaseous exchange and movement of nutrients and waste material occurs efficiently across the cell membrane. Should the cell expand, then the volume would increase, decreasing the surface area: volume ratio. This would decrease the rate of movement of nutrients and waste material across the cell membrane, also the energy demand of the cell would be higher compared to a smaller cell.

Thus, cell division occurs to circumvent this.

B)As they grow their service area increases faster than their volume

Thats my answer

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

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