Suppose while walking along the beach, you find a green crystal. Which properties could you use to determine whether the crystal is an emerald? Explain your reasoning.

color, cleavage, clarity, durability, and crystal system

Explanation: color - distinctly green color that ranges between bluish green and slightly yellowish green.

cleavage - one direction of imperfect cleavage

clarity - almost every natural emerald has eye-visible characteristics that can be inclusions, surface-reaching fractures, or healed fractures. Treatments to fill the fractures with oils, waxes, polymers, flux and other materials to reduce their visibility has been common practice for hundreds of years.

durability - emerald is very hard, but almost all specimens have inclusions and surface-reaching fractures that compromise their durability

crystal system - hexagonal

you can get banned on this website if you post your quizzes here. . . .

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!