Imagine a male dragonfly is flying around in an aggressive pattern to find an appropriate mate in a wetland with many species of dragonflies and damselflies. Finally, he spots a female dragonfly that appears to be of the same species, based on her flight behavior and color, and the two mate. The sperm of the male, however, are unable to fertilize the eggs of the female when she lays them because her egg cell membrane proteins and carbohydrates do not recognize and bind to the male's sperm. This is an example of:

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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!