This lesson discussed the engineering design process and the devastation of three ecosystems: the Kitakami River region, the Abukuma Highlands, and Japan's coastal habitat. In this activity, you will select one of these ecosystems and follow the steps of the engineering design process to design a recovery solution. Complete each section of the Recovering Ecosystems Worksheet, including the problem, sub-problems, criteria and constraints, and proposed solutions for ecosystem recovery. Instructions for each section are included in the worksheet. Be sure to review the assignment's rubric before completing and submitting this assignment.

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!

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blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.