False.
The semilunar valves are the pulmomic and aortic values.
the mitral and tricuspid valves prevent back flow of blood into the atria.
Chemical Weathering<span> results from chemical reactions between minerals in rocks and external agents like air or water. Oxygen oxidizes minerals to alteration products whereas water can convert minerals to clays or dissolve minerals completely. is that what your asking?</span>
The appropriate response is Melena. It alludes to the dull dark, hesitate dung that are related with upper gastrointestinal dying. The dark shading and trademark solid scent are caused by hemoglobin in the blood being changed by stomach related catalysts and intestinal microscopic organisms.
The nucleus is able to control and regulate the rest of the cell(it basically tells it what to do). The DNA is made up of chromosomes,the DNAs shape is a double helix and is tightly packed inside of the nucleus. The job of the DNA is to regulate the rest of the cell and tell the cell what kind of cell it is and what job it needs to do(ex all cells are different so the dna determines the type of cell like a bone cell or blood cell) this ties in with genetic because your dna makes up your cells and your cells make up who you are.
