In chemistry class, Allen determined the effectiveness of various metals in releasing hydrogen gas from hydrochloric acid.  Several weeks later, Allen read that a utilities company was burying lead next to iron pipes to prevent rusting.  Allen hypothesized that less rusting would occur with the more active metals.  He placed the following into separate beakers of water:  (a) 1 iron nail, (b) 1 iron nail wrapped with an aluminum strip, (c) 1 iron nail wrapped with a magnesium strip, (d) 1 iron nail wrapped with a lead strip.  He used the same amount of water, equal amounts (mass) of metals, and the same type of iron nails.  At the end of 5 days, he rated the amount of rusting as small, moderate, or large.  He also recorded the color of the water. consistency;

testability;

Tentativeness;

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!

honestly, i believe it's a.true.

do i get brainliest? ?

am i right? ?