The diagram below shows an example of ecological succession.
How can you tell from the diagram that this is an example of
secondary succession rather than of primary succession?
Select one
22
The sizes of the plants generally increase over time
No plants exist when the process begins
Soil
Grasses Shrubs Trees
Large
trees
The process ends with the growth of large trees
O
Soil is present at the beginning of the process

plant because they survive by water, sunlight, ex.

explanation:

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

i think the answer is composed of atoms

a compound light microscope is used to magnify objects in steps.  

hope it