When radiation is used to treat a nonmelanoma skin cancer, which of the following treatment techniques offers the best cosmetic effect? a. Parallel-opposed high-energy photons b. Interstitial brachytherapy c. Single field low-energy electron d. Single field low-energy photon

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

not always but somethings can be reproduced in a laboratory.