1s orbital
Explanation:
The electron has to go into the first energy level, in the 1s orbital. Helium, with two protons, will have two electrons. These are placed one at a time into the 1s orbital. This makes helium a very contented atom.
It means to take certain types o the organism that have favorable traits and breed them to keep producing such favorable traits, such as continually breeding fatter chickens or cows, or certain breeds or pure-bred dogs.
The correct answer is endothelium.
The endothelium is a thin layer of single-layered, squamous cells that can be found in the lumen of blood vessels, on the interior surfaces of the heart chambers, in the glomerulus of the kidney...The main function of endothelium is barrier function when it acts as a semi-selective barrier between the lumen of the vessels and surrounding tissue, and thus, controls the passage of materials. The endothelium is also included in functions such as fluid filtration in the kidneys, the control of blood pressure (vasodilatation and vasoconstriction), inflammation.
Answer:
branched chains, linear chains, and bezene rings
Do stones for her drains and little stoppers to keep leaves and dirt from entering the water that goes to diff plants and sewers
