Sandra is conducting an investigation on soil. She poked several small holes in the bottoms of three plastic cups and filled one with sand, one with clay, and one with loam. She set each cup of soil inside a slightly smaller cup, like in the picture shown. She poured the same amount of water into each cup of soil and came back one hour later to measure how much water had dripped through each soil. The following amounts of water were found at the bottoms of the smaller cups. sand: 4ml
clay: 0ml
loam: 2.5ml

Based on this information, what was sandra MOST LIKELY investigating?
A. She was measuring how well each soil holds plants.
B. She was measuring the particle sizes found in each soil.
C. She was testing the ability of each type of soil to hold water.
D. She was measuring the amount of air found in each soil.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.