The chart shows the number of hours full-time college students spend participating in various activities during an average weekday. A pie graph titled Time Use in Hours on an Average Weekday for a Full Time College Student shows the following activities: 1.5 travelling, 2.2 other, 0.8 grooming, 1.1 eating and drinking, 3.4 educational activities, and 3.0 working, 8.4 sleeping, and 3.6 leisure and sports.

According to the graph, approximately how many hours do college students have
available every weekday to devote to fitness? For P. E
30 points

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!

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.