A slide of human blood cells was observed in focus under the low-power objective. when the microscope was switched to high power, the image was dark and fuzzy. which parts of the microscope should be used to correct this situation

Gregor mendel is best known for his work with pea plants and for uncover many of the mysteries of genetics. one of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. what is the the name given to these units of inheritance which can be found on chromosomes? a) centromeres b) cytoplasm c) genes d) nucleotides

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

Adistinctive characteristic of mammals that is not observed in other vertebrates is