Write down any observations you have made regarding the effect of pollution on the environment.

Pollution refers to the introduction into or the presence in the environment of a thing or a substance, which has poisonous or harmful influences.

The pollution is affecting our surrounding or environment in a drastic way. The pollution from cars, oil spills and littering can exhibit a major influence on the environment.

It can harm the crops, which affects the food we eat, the waterways, and the air we breathe in due to overriding of greenhouse gases. All this simultaneously also exhibit a certain amount of influence on the animals as well.

did you fail the test? xd

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!