Arain forest primate called an aye-aye has an extremely long middle finger that it uses to probe for insects in cracks and crevices in tree bark. this connection between structure and function developed gradually over time as a result

The correct answer is - natural selection.

Explanation:

Natural selection is the process in which an organism adapted according to environmental changes for its survival and increase there number by reproduction.

Charles Darwin was first to explain its activities and now it's established as the major process behind the evolution.

Aye aye, primate adapted according to the environment and develop a character for its survival over a period of time. Natural selection is the connection between structure and function.

Thus, the correct answer is - natural selection.

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!