17. According to the heterotroph hypothesis, heat was necessary for life to develop in the oceans of the
primitive Earth because
A) energy is needed to form the bonds used in the
synthesis of organic compounds
B) autotrophic organisins need heat to synthesize
inorganic compounds
C) primitive enzymes require high temperatures to
function
D) high temperatures are necessary for
reproduction to occur in aggregates

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!

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.

this would be called the responsiveness