1.How does being made of many cells help large organisms maintain homeostasis? 2.Include an explanation of how the surface area-to-volume ratio, diffusion rate, and time for substances to reach the center are related. Support your explanation with data
3. what do the results of the agar blocks indicate about the relationship between cell size and time for materials to reach the center of the cell

4.How does the surface area-to-volume ratio of a small cell compare to that of a large cell? (

Having many cells help large organisms maintain homeostasis because larger organisms have smaller surface-area to volume ratio ( i.e. does not require large cell to carryout every function in the organism ).

Certain single celled organisms like Amoeba which are flat in nature possess a high surface area to volume ratio therefore diffusion of materials into them are faster and this makes it difficult for them to achieve homeostasis.

Larger cells will definitely posses a larger surface-area to volume ratio and hardly achieve homeostasis.

Hence we can conclude that large organisms maintain homeostasis by been having lower surface area to volume ratio.

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1.Small cell: has larger surface-area to volume ratio  

  Bigger Cell:  has little space to volume ratio

2. Surface area to volume ratio, in simple means the size of surface area to the volume of substance that can pass through it at a particular time.

Amoeba and some bacteria's are flat and have large surface area to volume ratio. So the diffusion rate is very high due to large surface area.

Where as humans have small surface area: volume so diffusion is very slow or does not take place at all.

3. Diffusion and Cell Size

The larger a cell is, the greater the surface area available for diffusion. ... Smaller cells have a much greater surface area to volume ratio allowing material to diffuse throughout the entire volume of the cell quickly and efficiently.

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.