16 Select all the correct answers
A population of mussels was observed in a particular ecosystem. It was found that crabs preferred these mussels as their favorite food. Few
mussels developed a thicker shell to protect themselves from crabs found in the region. Which three statements does this adaptation suggest?
A change in the environment led to a new distribution of traits in a population.
The trait of shell thickening underwent natural selection.
The trait for shell thickening will not be selected by future mussel generations.
Half of the mussel population developed the trait while the other half did not.
Mussels with the shell thickening trait had a greater chance of survival.
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i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

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!

multiply it by 5 in order for you to understand i cant give an exact answer.

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