Why is it important to remember that people are part of the environment too?

The environment is a basic need for well-being, economic, and healthy prosperity. The environment in which we humans thrive is the source of water, food, minerals, and air, and it comprises the solid, gaseous, and liquid components of the planet. The distinct species of forests, the flora and the fauna associate in a composite manner in the environment and naturally plays an essential role in balancing for the optimal survival of the species.  

However, human activities have resulted in the disturbances, which has caused extinction of wide ranges of both plants and animal species. The forests are cleared, the air and water are getting polluted, and the environment is no more considered secure for the upcoming generation. Thus, it is important for the people to remember that they are the part of environment too as life would not be possible if the environment becomes too much polluted.  

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!