1. two points
2.respiratory and organs
3.heart and heart
4.homogenous process/system
Biological cell membranes are selectively permeable, which means that the ease and rate of small molecules passing through membranes vary widely. The plasma membrane regulates exchange of nutrients, oxygen, inorganic ions, waste products, and water. The cellular membrane’s molecular organization controls permeability.
The best estimate<span> for </span>Earth's age<span> is based on radiometric dating of fragments from the Canyon Diablo iron meteorite. From the fragments, </span>scientists calculated<span> the relative abundances of elements that formed as radioactive uranium decayed over billions of years.</span>
<span>The domain that contains unicellular organisms that live in extreme environments is Archaea.</span>
The correct answer is option A, that is, a solution with a pH of 1.
pH refers to the unit of measure utilized to articulate the extent of acidity of a substance. The pH scale varies from 0 to 14. A pH of 0 means a very high acid activity, the hydrochloric acid, and nitric acid are very strong with pH values of 0, while the stomach acid exhibits a pH of 1.
Technically, the scale of pH, in reality, depicts the amount of positively charged H+ ions and negatively charged OH- ions in a solution. The pH scale is a logarithmic one, that is, each unit of pH exhibits 10 times as more ions of hydrogens in comparison to the unit above it.
Therefore, in a solution of pH 1, there are 10^9 times more hydrogen ions in comparison to the solution at pH 10.