If number of protons i the nucleus of Ca is 20, What is the number of electrons of the atom? * 40 electrons 20 electrons 21electrons 10 electrons

Which best describes the scientific process

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms

During the process of blank and molecules such as a glucose must use a protein channel to cross through a cell membrane