An important characteristic of urine is its specific gravity or density, which is
a. 1.041-1.073
b. 1.001-1.035
c. 1.030-1.040
d. 1.000-1.015

Witch theory suggests all living things are made up of cell or cells

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes