Prompts/Stimulus 1. Read the following article about the International Space Station (ISS).
1a. In t
2009, Canadian astronaut Robert Thirsk began a six-month stay
Io24h. ternational Space Stationer (15) ok betong ariana Bath Time
1b. WE
1c. Wh
1d. Wh
le. Wh
occur?
Could
astronauts on the ISS place their lives in the hands of the space station's
advanced life support system. For the astronauts to survive in space,
the temperature and pressure within the ISS must be maintained. An
adequate supply of oxygen must be provided, and waste gases, such as
carbon dioxide, must be removed. Solid waste must also be removed,
but urine is recycled to provide the crew with clean water. All of these
functions are achieved with the help of advanced technology systems.
All the systems on the ISS must work together to support life on
board. The same is true inside your body. Like the life support system
on the ISS, your organ systems must work together to keep you alive.
For instance, your body needs systems that enable it to take in
oxygen and remove carbon dioxide.
2. Human Body as a System:
What is the system ?

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!

well the answer is 2!

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.